A Study of
Motorcycle
Oils
Second Edition
AMSOIL Power Sports Group
© June 2009, AMSOIL INC.
Table of Contents
Overview.................................................................................................................................................3
Purpose..................................................................................................................................................4
Method....................................................................................................................................................4
Scope......................................................................................................................................................4
Review Candidates................................................................................................................................5
Physical Properties, Performance Results and Prices.........................................................................6
SAE Viscosity Grade (Initial Viscosity - SAE J300)...........................................................................................6
Viscosity Index (ASTM D-2270)....................................................................................................................8
Viscosity Shear Stability (ASTM D-6278)........................................................................................................9
High Temperature/High Shear Viscosity (HT/HS ASTM D-5481)........................................................................11
Zinc Concentration (ppm, ICP)...................................................................................................................12
Wear Protection (4-Ball, ASTM D-4172).......................................................................................................13
Gear Performance (FZG ASTM D-5182).......................................................................................................14
Oxidation Stability (TFOUT ASTM D-4742)...................................................................................................16
Volatility (Evaporation) (ASTM D-5800)........................................................................................................17
Acid Neutralization and Engine Cleanliness (TBN ASTM D-2896)......................................................................18
Foaming Tendency (ASTM D-892)..............................................................................................................19
Rust Protection (Humidity Cabinet ASTM D-1748).........................................................................................20
Pricing..................................................................................................................................................21
Wet-Clutch Compatibility (JASO T 904:2006, limited review).............................................................................22
Scoring and Summary of Results.........................................................................................................23
Conclusion............................................................................................................................................25
Appendix A...........................................................................................................................................26
Affidavit of Test Results.............................................................................................................................26
References............................................................................................................................................27
2
Editor’s Note: At the time of its original printing in December 2005, the A Study of Motorcycle Oils white paper represented
the most comprehensive study of motorcycle oils ever published. The document served to educate hundreds of thousands of
readers on the complex dynamic of motorcycle oil and motorcycle operation. The paper revealed, through an exhaustive series
of relevant industry tests, that the motorcycle oils available to consumers varied greatly in quality and in their ability to perform
the functions of motorcycle lubrication.
This second edition printing maintains the same scientific approach and includes the same testing protocol. Additional oils
were tested, and some of the original oils tested differently than they had initially, indicating formulation changes. It should
be noted that while some oils tested more poorly than they initially had, others showed improvement. Whether or not this
improvement can be credited to the data revealed in the original publication remains a matter of speculation. In any case,
as motorcycle oils continue to improve, consumers will benefit.
Overview
Motorcycles have long been used as a popular means of general transportation as well as for recreational use. There are
nearly seven million registered motorcycles in the United States, with annual sales in excess of one million units. This trend
is unlikely to change. As with any vehicle equipped with an internal combustion engine, proper lubrication is essential to
insure performance and longevity. It is important to point out that not all internal combustion engines are similarly designed
or exposed to the same types of operation. These variations in design and operation place different demands on engine
oils. Specifically, the demands placed on motorcycle engine oils are more severe than those placed on automotive engine
oils. Therefore, the performance requirements of motorcycle oils are more demanding as well.
Though the degree may be debatable, few will disagree that a difference exists between automotive and motorcycle applications. In which area these differences are and to what degree they alter lubrication requirements are not clear to most
motorcycle operators. By comparing some basic equipment information, one can better understand the differences that exist.
The following comparison information offers a general synopsis of both automotive and motorcycle applications.
Vehicle
Equipment
Type
Engine
Cooling
Displacement
Lubricant
Reservoir
Compression Max. HP@ HP per
Ratio
RPM
C.I.
Honda
Accord
Automotive
Water
cooled
183 cu. in.
Single, engine only
10:1
240@6,250
1.3
Ford
Explorer
Automotive
SUV
Water
cooled
281 cu. in.
Single, engine only
9.4:1
239@4,750
.85
Dodge Ram
L/D Truck
Water
cooled
345 cu. in.
Single, engine only
9.6:1
345@5,400
.99
Chevrolet
Corvette
Automotive
Performance
Water
cooled
366 cu. in.
Single, engine only
10.9:1
400@6,000
1.1
Honda CBR
1000 RR
Motorcycle
Performance
Water
cooled
61 cu. in.
Shared - engine &
transmission
11.9:1
153@11,000
2.5
BMW R
1200 RT
Motorcycle
Touring
Air & Oil
cooled
71.4 cu. in.
Separate - engine
& transmission
11.0:1
110@7,500
1.5
H/D Road
King
FLHRSI
Motorcycle
Large Bore
Air cooled
88 cu. in.
Separate - engine
& transmission
8.8:1
58@5,000
.66
Yamaha
YZ450F
Motorcycle
Motocross
Water
cooled
27.1 cu. in.
Shared, engine &
transmission
12.3:1
47.2@8,700
1.7
There are six primary differences between motorcycle and automotive engine applications:
1. Operational Speed - Motorcycles tend to operate at engine speeds significantly higher than automobiles. This
places additional stress on engine components, increasing the need for wear protection. It also subjects lubricating
oils to higher loading and shear forces. Elevated operating RPMs also promote foaming, which can reduce an oil’s
load-carrying ability and accelerate oxidation.
2. Compression Ratios - Motorcycles tend to operate with higher engine compression ratios than automobiles.
Higher compression ratios place additional stress on engine components and increase engine operating temperatures. Higher demands are placed on the oil to reduce wear. Elevated operating temperatures also promote thermal
degradation of the oil, reducing its life expectancy and increasing the formation of internal engine deposits.
3. Horsepower/ Displacement Density - Motorcycle engines produce nearly twice the horsepower per cubic inch
of displacement of automobile engines. This exposes the lubricating oil to higher temperatures and stress.
3
4. Variable Engine Cooling - In general, automotive applications use a sophisticated water-cooling system to control engine operating temperature. Similar systems can be found in motorcycle applications, but other designs also
exist. Many motorcycles are air-cooled or use a combination air/oil design. Though effective, they result in greater fluctuations in operating temperatures, particularly when motorcycles are operated in stop-and-go traffic. Elevated operating temperature promotes oxidation and causes oils to thin, reducing their load carrying ability.
5. Multiple Lubrication Functionality - In automotive applications, engine oils are required to lubricate only the
engine. Other automotive assemblies, such as transmissions, have separate fluid reservoirs that contain a lubricant
designed specifically for that component. The requirements of that fluid differ significantly from those of automotive
engine oil. Many motorcycles have a common sump supplying oil to both the engine and transmission. In such cases,
the oil is required to meet the needs of both the engine and the transmission gears. Many motorcycles also incorporate a frictional clutch within the transmission that uses the same oil.
6. Inactivity - Motorcycles are typically used less frequently than automobiles. Whereas automobiles are used on a
daily basis, motorcycle use is usually periodic and in many cases seasonal. These extended periods of inactivity place
additional stress on motorcycle oils. In these circumstances, rust and acid corrosion protection are of critical concern.
It is apparent that motorcycle applications place a different set of requirements on lubricating oils. Motorcycle oils, therefore, must be formulated to address this unique set of high stress conditions.
Purpose
The purpose of this paper is to provide information regarding motorcycle applications, their lubrication needs and typical
lubricants available to the end user. It is intended to assist the end user in making an educated decision as to the lubricant
most suitable for his or her motorcycle application.
Method
The testing used to evaluate the lubricants was done in accordance with American Society for Testing and Materials (ASTM)
procedures. Testing was finalized in May 2009. Test methodology has been indicated for all data points, allowing for duplication and verification by any analytical laboratory capable of conducting the ASTM tests. A notarized affidavit certifying
compliance with ASTM methodology and the accuracy of the test results is included in the appendix of this document. Five
different laboratories were used in the generation of data listed within this document. In all cases blind samples were submitted to reduce the potential of bias.
Scope
This document reviews the physical properties and performance of a number of generally available motorcycle oils. Those
areas of review are:
1. An oil’s ability to meet the required viscosity grade of an application.
2. An oil’s ability to maintain a constant viscosity when exposed to changes in temperature.
3. An oil’s ability to retain its viscosity during use.
4. An oil’s ability to resist shearing forces and maintain its viscosity at elevated temperatures.
5. An oil’s zinc content.
6. An oil’s ability to minimize general wear.
7. An oil’s ability to minimize gear wear.
8. An oil’s ability to minimize deterioration when exposed to elevated temperatures.
9. An oil’s ability to resist volatilization when exposed to elevated temperatures.
10. An oil’s ability to maintain engine cleanliness and control acid corrosion.
11. An oil’s ability to resist foaming.
12. An oil’s ability to control rust corrosion.
Individual results have been listed for each category. The results were then combined to provide an overall picture of the
ability of each oil to address the many demands required of motorcycle oils.
4
Review Candidates
Two groups of candidate oils were tested, SAE 40 grade oils and SAE 50 grade oils. The oils tested are recommended
specifically for motorcycle applications by their manufacturers.
SAE 40 Group
Brand
Viscosity Grade
Base
Batch Number
AMSOIL MCF
10W-40
Synthetic
11631 231
Bel-Ray EXS Super Bike
0W-40
Synthetic
AF 25940607
Castrol Power RS R4 4T
5W-40
Synthetic
14/02/28/C7011996
Honda HP4
10W-40
Syn / Petro Blend
7KJA0001
Lucas High Performance
10W-40
Syn / Petro Blend
None indicated on container
Maxima Maxum 4 Ultra
5W-40
Synthetic
1608
Mobil 1 Racing 4T
10W-40
Synthetic
X10C8 4967
Motul 300V Factory Line
10W-40
Synthetic
04611/03235M1
Pennzoil Motorcycle Oil
10W-40
Petroleum
HLPA418968/04237 21:00
Pure (Polaris) Victory
20W-40
Syn / Petro Blend
LT7 2 239
Royal Purple Max-Cycle
10W-40
Synthetic
ICPMO4701
Spectro, Platinum SX4
10W-40
Synthetic
16290
Suzuki, 4-Cycle Syn Racing
10W-40
Synthetic
HLPA358224/01106/03:47
Torco T-4SR
10W-40
Synthetic
PSPAG-L96296
Valvoline 4-Stroke
10W-40
Petroleum
0148C2
Viscosity Grade
Base
Batch Number
AMSOIL MCV
20W-50
Synthetic
11678 253
Bel-Ray V-Twin
10W-50
Synthetic
AF22311106
BMW Super Synthetic
15W-50
Synthetic
17233
Castrol V-Twin
20W-50
Syn / Petro Blend
19/05/06 6003206
Harley Davidson HD 360
20W-50
Petroleum
0932C0798 1242
Harley Davidson SYN 3
20W-50
Synthetic
0021000248
Honda HP4
20W-50
Syn / Petro Blend
7IJA0001
Lucas High Performance
20W-50
Synthetic
None indicated on container
Maxima Maxum 4 Ultra
5W-50
Synthetic
28107
Mobil 1 V-Twin
20W-50
Synthetic
X04D8 4967
Motul 7100 Ester
20W-50
Synthetic
02610/A/83243
Pennzoil Motorcycle
20W-50
Petroleum
HLPA429090/07237 23:15
Royal Purple Max-Cycle
20W-50
Synthetic
ICPJ25705
Spectro, Platinum HD
20W-50
Synthetic
16785
Suzuki 4-Cycle V-Twin
20W-50
Syn / Petro Blend
HLPA351478/01096/10:34
Torco V-Series SS
20W-50
Synthetic
L90974 LRU1G SA
Valvoline 4-Stroke
20W-50
Petroleum
B268C2
SAE 50 Group
Brand
5
Physical Properties, Performance Results and Prices
SAE Viscosity Grade (Initial Viscosity - SAE J300)
A lubricant is required to perform a variety of tasks. Foremost is the minimization of wear. An oil’s first line of defense is its
viscosity (thickness). Lubricating oils are by nature non-compressible and when placed between two moving components
will keep the components from contacting each other. With no direct contact between surfaces, wear is eliminated. Though
non-compressible, there is a point at which the oil film separating the two components is insufficient and contact occurs.
The point at which this occurs is a function of an oil’s viscosity. Generally speaking, the more viscous or thicker an oil, the
greater the load it will carry. Common sense would suggest use of the most viscous (thickest) oil. However, high viscosity
also presents disadvantages. Thicker oils are more difficult to circulate, especially when an engine is cold, and wear protection may be sacrificed, particularly at start-up. Thicker oils also require more energy to circulate, which negatively affects
engine performance and fuel economy. Furthermore, the higher internal resistance of thicker oils tends to increase the operating temperature of the engine. There is no advantage to using an oil that has a greater viscosity than that recommended
by the equipment manufacturer. An oil too light, however, may not possess sufficient load carrying ability to meet the
requirements of the equipment.
From a consumer standpoint, fluid viscometrics can be confusing. To ease selection, the Society of Automotive Engineers
(SAE) has developed a grading system based on an oil’s viscosity at specific temperatures. Grading numbers have been
assigned to ranges of viscosity. The equipment manufacturer determines the most appropriate viscosity for an application
and indicates for the consumer which SAE grade is most suitable for a particular piece of equipment. Note that the SAE
grading system allows for the review of an oil’s viscosity at both low and high temperatures. As motorcycle applications
rarely contend with low temperature operation, that area of viscosity is not relevant to this discussion.
The following chart identifies the viscosities of the oils before use. The purpose of testing initial viscosity is to ensure that
the SAE grade indicated by the oil manufacturer is representative of the actual SAE grade of the oil, and that it is therefore
appropriate for applications requiring such a fluid. The results were obtained using American Society for Testing and
Materials (ASTM) test methodology D-445. The fluid test temperature was 100° C and results are reported in centistokes.
Using SAE J300 standards, the SAE viscosity grades and grade ranges for each oil were determined and are listed below.
SAE 40 Group
Brand
Indicated
Viscosity Grade
Measured Viscosity
@ 100° C cSt
AMSOIL MCF
10W-40
14.45
Yes
Bel-Ray EXS Super Bike
0W-40
14.13
Yes
Castrol Power RS R4 4T
5W-40
12.95
Yes
Honda HP4
10W-40
13.75
Yes
Lucas High Performance
10W-40
13.56
Yes
Maxima Maxum 4 Ultra
5W-40
12.67
Yes
Mobil 1 Racing 4T
10W-40
13.98
Yes
Motul 300V Factory Line
10W-40
13.03
Pennzoil Motorcycle Oil
10W-40
15.24
Yes
Pure (Polaris) Victory
20W-40
14.60
Yes
Royal Purple Max-Cycle
10W-40
13.51
Yes
Spectro, Platinum SX4
10W-40
14.61
Yes
Suzuki, 4-Cycle Syn Racing
10W-40
14.72
Yes
Torco T-4SR
10W-40
15.60
Yes
Valvoline 4-Stroke
10W-40
15.22
Yes
6
SAE Viscosity
Range for
40 Grade
12.5 to <16.3
Within Grade
Yes
SAE 50 Group
Brand
Indicated
Viscosity Grade
Measured Viscosity SAE Viscosity
@ 100° C cSt
Range for
50 Grade
Within Grade
AMSOIL MCV
20W-50
20.56
Yes
Bel-Ray V-Twin
10W-50
16.95
Yes
BMW Super Synthetic
15W-50
17.88
Yes
Castrol V-Twin
20W-50
18.49
Yes
Harley Davidson HD 360
20W-50
20.50
Yes
Harley Davidson SYN 3
20W-50
20.38
Yes
Honda HP4
20W-50
17.58
Yes
Lucas High Performance
20W-50
17.75
Yes
Maxima Maxum 4 Ultra
5W-50
15.69
Mobil 1 V-Twin
20W-50
21.04
Yes
Motul 7100 Ester
20W-50
17.94
Yes
Pennzoil Motorcycle
20W-50
20.69
Yes
Royal Purple Max-Cycle
20W-50
20.09
Yes
Spectro, Platinum HD
20W-50
19.26
Yes
Suzuki 4-Cycle V-Twin
20W-50
19.82
Yes
Torco V-Series SS
20W-50
21.05
Yes
Valvoline 4-Stroke
20W-50
18.18
Yes
16.3 to < 21.9
No
The results show that all of the oils tested except Maxima Maxum 4 Ultra 20W-50 have initial viscosities consistent with
their indicated SAE viscosity grades. Those oils consistent with their indicated SAE viscosity grades are appropriate for use
in applications recommending these grades/viscosities.
7
Viscosity Index (ASTM D-2270)
The viscosity (thickness) of an oil is affected by temperature changes during use. As the oil’s temperature increases, its viscosity will decrease. The degree of change that occurs with temperature is determined by using ASTM test methodology D2270. Referred to as the oil’s Viscosity Index, the methodology compares the viscosity change that occurs between 100° C
(212° F) and 40° C (104° F). The higher the viscosity index, the less the oil’s viscosity changes with changes in temperature.
While a greater viscosity index number is desirable, it does not represent that oil’s high temperature viscosity or its load carrying ability. Shearing forces within the engine, and particularly the transmission, can significantly reduce an oil’s viscosity.
Therefore, oils with a lower viscosity index but higher shear stability can, in fact, have a higher viscosity at operating
temperature than one with a higher viscosity index and lower shear stability.
Ambient temperatures can also effect an oil’s viscosity. Oil thickens as outside temperatures decrease, leading to pumpability and circulation concerns. Oils with high viscosity indices function better over a broader temperature range than those with
lower numbers. This is important if equipment is used year round in colder climates.
Results - Viscosity Index, SAE 40 Group
149
152
154
150
156
157
161
160
163
167
171
172
170
173
175
180
180
157
190
140
130
117
120
V
is
Po
l
ar
on
da
ic
H
to
P
ry
4
4T
H
M
ob
il
e
R
4-
ac
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tr
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g
in
ac
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R
ok
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uz
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P
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ax
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To
r
R
ol
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4
an
m
fo
r
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s
ca
Lu
Results - Viscosity Index, SAE 50 Group
181
180
182
190
124
130
130
131
124
120
141
138
130
145
152
158
156
148
140
159
150
160
160
160
170
110
ax
M
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ca
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110
8
Viscosity Shear Stability (ASTM D-6278)
An oil’s viscosity can be affected through normal use. Mechanical activity creates shearing forces that can cause an oil to
thin out, reducing its load carrying ability. Engines operating at high RPMs and those that share a common oil sump with
the transmission are particularly subject to high shear rates. Gear sets found in the transmissions are the leading cause of
shear-induced viscosity loss in motorcycle applications.
The ASTM D-6278 test methodology is used to determine oil shear stability. First an oil’s initial viscosity is determined. The
oil is then subjected to shearing forces using a test apparatus outlined in the methodology. Viscosity measurements are
taken at the end of 15, 30 and 90 cycles and compared to the oil’s initial viscosity. The oils that perform well are those that
show little or no viscosity change. Oils demonstrating a significant loss in viscosity would be subject to concern. The flatter
the line on the charts below, the greater the shear stability of the oil. Each SAE grade was split into two or more groups to
make the charts easier to reference.
Results - Viscosity Shear Stability SAE 40 Group 1
15
SAE 40
14
4
6
8
7
13
1
1
1 AMSOIL MCF
3
2
4
2
3
4
2 Polaris Victory
5
6
5 Motul 300 V
3 Spectro Platinum SX4
4
6
5
Mobil Racing 4T
5
OUT OF INDICATED VISCOSITY GRADE
12
6 Honda HP 4
7
11
SAE 30
Viscosity - cSt @ 100° C
3
2
1
7
7 Royal Purple Max-Cycle
8
8
10
9
8 Lucas High Performance
0 Cycles
15 Cycles
30 Cycles
90 Cycles
SAE 40 Oils Tested in Group #1
Polaris Victory 3
1
AMSOIL MCF
4
Mobil Racing 4T
7
Royal Purple Max-Cycle
2
Motul 300 V
5
Spectro Platinum SX4
Honda HP 4
6
Lucas High Performance
8
Results - Viscosity Shear Stability SAE 40 Group 2
14
SAE 40
15
7
61
4
1
1
2
2
13
12
11
1 Pennzoil Motorcycle
2
4
3
5
3
4
3
5
5
2 Bel-Ray EXS
3
4 Castrol RS R4
OUT OF INDICATED VISCOSITY GRADE
6
7
5
Suzuki Syn Racing
Maxima 4 Ultra
6
SAE 30
Viscosity - cSt @ 100° C
16
6 Valvoline 4-Stroke
7
7 Torco T-4SR
10
9
0 Cycles
15 Cycles
30 Cycles
90 Cycles
SAE 40 Oils Tested in Group #2
1
Pennzoil Motorcycle 2
4
Castrol RS R4
6
Valvoline 4-Stroke
Bel-Ray EXS
Maxima 4 Ultra
5
Torco T-4SR
7
9
3
Castrol RS R4
Results - Viscosity Shear Stability SAE 50 Group 1
21.5
2
1
19.5
18.5
1
1 AMSOIL MCV
1
3
2
SAE 50
Viscosity - cSt @ 100° C
20.5
2
6
4
2 Pennzoil Motorcycle
17.5
15.5
14.5
13.5
3
4
3
4
OUT OF INDICATED VISCOSITY GRADE
5
SAE 40
16.5
6
5
4
3
BMW Motor Oil
Royal Purple Max Cycle
5 Maxima 4 Ultra
6
6
5
Lucas High Performance
0 Cycles
15 Cycles
30 Cycles
90 Cycles
SAE 50 Oils Tested in Group #1
1
AMSOIL MCV
2
Pennzoil Motorcycle
3
Royal Purple Max Cycle
4
BMW Motor Oil
5
Maxima 4 Ultra
6
Lucas High Performance
Results - Viscosity Shear Stability SAE 50 Group 2
2
1
20.5
1
1
1 Mobil V-Twin
2
2
2 Torco V Series SS
19.5
18.5
SAE 50
3
5
3
3
17.5
3 Suzuki 4-Cycle V-Twin
4
16.5
15.5
14.5
13.5
4
4
SAE 40
Viscosity - cSt @ 100° C
21.5
OUT OF INDICATED VISCOSITY GRADE
5
4 Bel-Ray V-Twin
5
5
Valvoline 4-Stroke
0 Cycles
15 Cycles
30 Cycles
90 Cycles
SAE 50 Oils Tested in Group #2
1
Mobil V-Twin
2
Torco V Series SS
3
Suzuki 4-Cycle V-Twin
4
Bel-Ray V-Twin
5
Valvoline 4-Stroke
Results - Viscosity Shear Stability SAE 50 Group 3
20.5
18.5
SAE 50
19.5
4
3
15.5
14.5
13.5
6
3
1
1
3
2
2
5
17.5
16.5
1
2
1 Spectro Platinum HD
2 Motul 7100 Ester
3
Harley-Davidson Syn-3
6
4
5
4
6
5
OUT OF INDICATED VISCOSITY GRADE
SAE 40
Viscosity - cSt @ 100° C
21.5
4 Harley-Davidson HD 360
5 Honda HP-4
6 Castrol V-Twin
0 Cycles
15 Cycles
30 Cycles
90 Cycles
SAE 50 Oils Tested in Group #3
1
Spectro Platinum HD
2
Motul 7100 Ester
3
Harley-Davidson Syn-3
4
Harley-Davidson HD 360
5
Honda HP-4
6
Castrol V-Twin
10
The results point out significant differences between oils and their ability to retain their viscosity. Within the SAE 40 group,
40% of the oils dropped one viscosity grade to an SAE 30. Within the SAE 50 group, 53% dropped one grade to an SAE
40. Many of the oils losing a viscosity grade did so quickly, within the initial 15 cycles of shearing.
In order to meet motorcycle oil standards JASO T903:2006 and ISO 24254:2007, SAE 40 oils must not shear below 12
cSt in 30 cycles and SAE 50 oils must not shear below 15 cSt in 30 cycles. In the test, no SAE 50 oils fell below 15 cSt
at 30 cycles. Maxima 4 Ultra and Lucas High Performance, however, fell below the 15 cSt limit prior to 90 cycles. In the
SAE 40 group, Royal Purple Max-Cycle, Lucas High Performance, Torco T-4SR and Valvoline 4-Stroke fell below the 12
cSt limit in 30 cycles, while Honda HP4 fell below the limit in 90 cycles.
The importance of shear stability cannot be overstated. This same test is used to evaluate heavy duty diesel engine oils
subjected to service intervals as high as 50,000 miles in Class 8 trucks.
It should be noted that no correlation exists between the viscosity index of an oil and its ability to minimize shear. In the SAE
40 group, for example, the Lucas High Performance had the second-highest viscosity index, yet performed the worst when it
came to viscosity retention in the face of shearing forces. The AMSOIL MCF, on the other hand, had a significantly lower
viscosity index, yet placed first in the area of viscosity retention.
High Temperature/High Shear Viscosity (HT/HS ASTM D-5481)
Shear stability and good high temperature viscosity are critical in motorcycle applications. How these two areas in combination
affect the oil is measured using ASTM test methodology D-5481. The test measures an oil’s viscosity at high temperature under
shearing forces. Shear stable oils that are able to maintain high viscosity at high temperatures perform well in the High
Temperature/High Shear Test. The test is revealing as it combines viscosity, shear stability and viscosity index. It is important
because bearings require the greatest level of protection during high temperature operation. Test results are indicated in cetipoises (cP), which are units of viscosity. The higher the test result, the greater the level of viscosity protection offered by the oil.
Results - HT/HS, SAE 40 Group
4.8
3.91
4.00
4.04
3.8
4.00
4.14
4.17
4.20
4.10
cP
4.0
4.18
4.2
4.23
4.29
4.4
4.14
4.52
4.6
3.4
3.53
3.53
3.6
in
g
O
To
il
rc
o
Tob
M
4
S
ax
il
R
R
im
ac
a
in
Lu
M
g
ax
ca
4T
um
s
H
ig
4
h
U
R
lt
Pe
oy
ra
rf
al
or
P
m
ur
an
pl
B
el
e
ce
-R
M
ax
ay
-C
E
Pe
X
yc
S
nn
le
S
zo
up
il
er
M
bi
ot
ke
or
cy
C
as
cl
e
tr
O
ol
il
R
S
R
4
4T
H
on
da
H
P
4
4
X
S
m
yc
le
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i4
uk
S
uz
M
R
ac
nu
la
ti
P
o
tr
pe
c
S
S
to
tr
S
ic
V
4-
vo
l
in
e
is
V
al
Po
l
yn
ry
V
F
C
0
M
30
IL
ul
M
ot
O
S
M
A
ar
3.0
ok
e
3.2
Results - HT/HS, SAE 50 Group
4.78
4.86
4.88
4.86
4.98
4.88
4.36
4.5
5.10
5.34
5.0
5.26
5.42
5.34
6.02
5.43
cP
5.54
5.5
6.08
6.0
6.12
6.5
1
il
ob
M
H
To
r
co
V
-S
er
ie
s
S
S
V
-T
A
ar
w
M
le
in
S
yO
R
D
IL
oy
av
S
M
al
id
pe
C
so
V
P
ct
ur
n
ro
pl
S
P
yn
e
la
M
3
ti
a
nu
xC
m
S
yc
uz
H
le
uk
ea
H
i4
vy
ar
-C
D
le
yc
ut
yy
le
D
Lu
av
V
ca
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id
w
so
s
in
H
n
ig
H
h
D
Pe
36
rf
V
0
or
al
vo
m
an
lin
ce
e
4S
B
tr
M
ok
W
e
M
ot
M
ax
or
im
O
il
M
a
ot
4
ul
U
lt
Pe
71
r
a
nn
00
zo
E
il
st
M
er
ot
or
C
cy
as
cl
tr
e
ol
V
-T
w
H
on
in
da
B
el
H
-R
P
-4
ay
V
-T
w
in
4.0
11
Zinc Concentration (ppm, ICP)
Though viscosity is critical in terms of wear protection, it does have limitations. Component loading can exceed the load carrying ability of the oil. When that occurs, partial or full contact results between components and wear will occur. Chemical additives are added to the oil as the last line of defense to control wear in these conditions. These additives have an attraction to
metal surfaces and create a sacrificial coating on engine parts. If contact occurs the additive coating takes the abuse to minimize component wear. The most common additive used in internal combustion engine oils is zinc dithiophosphate (ZDP). A
simple way of reviewing ZDP levels within an oil is to measure the zinc content. It should be noted that ZDP defines a group
of zinc-containing compounds that vary in composition, quality and performance. Quantity of zinc content alone does not indicate its performance. Therefore, it cannot be assumed that oils with higher concentrations of zinc provide better wear protection. Additional testing must be reviewed to determine an oil’s actual ability to prevent wear. The wear testing further in this document reflects the general lack of correlation between zinc levels and wear protection. Due to this lack of correlation, zinc levels are not included in the scoring and summary of results contained in the review.
The tables below show the levels of zinc present in each of the oils. Results were determined using an inductively coupled
plasma (ICP) machine and are reported in parts per million.
Zinc levels varied widely in both the SAE 40 and 50 groups, ranging from as low as 996 ppm to as high as 2,209 ppm.
Results - Zinc Levels, SAE 40 Group
2500
O
lM
ot
or
cy
cl
e
da
1,001
il
1,012
1,016
4
P
H
g
in
on
H
ac
R
yn
S
uz
uk
i4
Pe
n
-C
nz
oi
ct
yc
le
ro
S
P
O
S
co
T4
0
30
ul
To
r
ot
R
V
4
X
S
m
nu
4-
la
ti
e
in
vo
l
pe
V
al
M
tr
S
er
up
B
S
el
ok
e
ke
bi
ce
an
m
fo
r
S
ay
-R
H
S
Pe
r
h
ig
ur
P
s
ca
Lu
X
R
M
e
pl
tr
as
C
R
oy
al
E
S
ax
R
-C
4
M
IL
O
ol
M
A
ax
M
yc
le
4T
F
C
ry
to
ic
V
S
is
ar
im
a
M
M
ob
Po
l
il
ax
R
um
ac
4
in
U
g
lt
ra
500
4T
700
il
1,016
1,021
1,093
900
1,108
1,160
1100
1,274
1300
1,278
1500
1,570
1700
1,417
1900
1,793
Parts Per Million
2100
1,106
2,209
2300
Results - Zinc Levels, SAE 50 Group
2400
2,163
2200
996
1,016
1,020
1,045
1,056
1,127
1,132
1,159
1,105
800
1,170
1,209
1000
1,307
1200
1,312
1400
1,434
1600
1,542
1,710
1800
V
h
B
pl
H
ig
s
ca
H
ar
e
M
ax
M
C
ut
y
O
IL
S
M
A
ur
P
R
oy
al
Lu
H
m
nu
la
ti
P
ro
S
pe
ct
D
in
ea
vy
V
-T
w
il
ob
M
ax
im
a
1
4
U
lt
ra
400
-C
Pe
yc
rf
le
or
m
el
an
-R
ce
le
a
yy
D
V
av
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w
id
in
so
n
C
S
as
yn
t
ro
V
3
al
lV
H
vo
ar
-T
lin
le
w
ye
i
n
D
4av
S
tr
id
ok
so
e
n
H
B
D
M
36
Pe
W
0
nn
M
ot
zo
S
or
il
uz
M
O
uk
ot
il
i4
or
cy
-C
yc
cl
e
le
M
ot
V
-T
ul
w
71
in
00
E
st
H
er
on
To
da
rc
o
H
V
P
-4
-S
er
ie
s
S
S
600
M
Parts Per Million
2000
12
Wear Protection (4-Ball, ASTM D-4172)
The ASTM D-4172 4-Ball Wear Test is a good measure of an oil’s ability to minimize wear in case of metal-to-metal contact.
The test consists of a steel ball that sits atop three identical balls that have been placed in a triangular pattern and restrained
from moving. All four balls are immersed in the test oil, which is heated and maintained at a constant temperature. The upper
ball is then rotated and forced onto the lower three balls with a load measured in kilogram-force (kgf). After a one-hour period of constant load, speed and temperature, the lower three balls are inspected at the point of contact. Any wear will appear
as a single scar on each of the lower balls. The diameter of the scar is measured on each of the lower balls and the results
are reported as the average of the three scars, expressed in millimeters. The lower the average scar diameter, the better the
anti-wear properties of the oil. In this case, the load, speed and temperature used for the test were 40 kg, 1800 RPMs and
150° C respectively.
Results - 4-Ball Wear Test, SAE 40 Group
1.077
1.1
1.0
0.731
0.721
0.709
0.661
0.649
V
C
ic
as
R
to
oy
tr
ry
ol
al
R
P
S
ur
R
pl
4
e
4T
M
ax
-C
yc
le
4
m
nu
ar
Po
l
la
ti
P
pe
ct
ro
is
da
H
S
P
X
4
il
O
on
H
cy
cl
e
nz
oi
lM
ot
R
or
ac
in
g
O
il
ce
an
fo
r
yn
S
S
Pe
n
yc
le
h
ig
H
s
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uk
S
uz
Lu
i4
ca
ax
M
m
S
4-
Pe
r
e
R
in
vo
l
V
al
M
ok
e
tr
g
in
ac
ul
ot
ob
il
M
M
im
a
4T
V
0
30
lt
U
4
er
up
S
um
ax
X
E
ay
-R
el
B
ra
ke
bi
C
M
O
S
M
A
To
rc
o
T4S
R
0.2
IL
0.3
F
0.353
0.410
0.4
0.637
0.5
0.628
0.558
0.604
0.6
0.670
0.7
0.701
0.8
0.804
0.9
S
Wear Scar Diameter (mm)
1.2
Results - 4-Ball Wear Test, SAE 50 Group
1.107
1.1
1.0
0.455
0.724
0.719
0.693
0.662
0.652
0.648
0.642
0.607
av
U
lt
id
ra
so
nz
n
oi
S
lM
yn
ot
3
or
B
el
cy
-R
c
V
le
ay
al
Lu
V
vo
ca
-T
S
lin
w
s
pe
e
in
H
ct
4ig
ro
S
h
tr
Pe
P
ok
la
rf
e
ti
or
nu
m
m
an
H
ce
ea
vy
D
H
ut
on
y
da
C
S
a
H
uz
st
P
uk
-4
ro
lV
i4
-T
-C
w
yc
in
le
M
H
ot
V
ar
-T
ul
le
w
7
yin
10
D
av
0
E
id
st
so
er
n
H
R
B
oy
D
M
36
W
al
0
M
P
ur
ot
pl
or
e
O
M
il
ax
-C
yc
le
V
-T
w
in
a
im
Pe
n
M
ax
H
ar
le
yD
il
1
4
IL
S
O
M
A
co
To
r
M
ob
V
-S
er
ie
s
M
C
S
S
0.2
V
0.3
0.373
0.4
0.395
0.5
0.546
0.6
0.605
0.7
0.687
0.8
0.786
0.9
0.363
Wear Scar Diameter (mm)
1.2
Torco and AMSOIL motorcycle oils finished first and second respectively in both the SAE 40 and SAE 50 groups.
Interestingly, Torco oils had among the lowest zinc levels of all oils tested, while the AMSOIL oils had zinc levels in the middle to upper range. Although the Maxima oils contained the highest levels of zinc, each placed fourth in its respective 4-Ball
Wear Test. Royal Purple oils featured zinc levels similar to those of the AMSOIL oils. However, the wear scars were 2.6 to
2.8 times greater and they ranked last in each test.
The results strongly suggest that simply having high levels of zinc is not sufficient to effectively minimize wear.
13
Gear Performance (FZG ASTM D-5182)
Wear protection is provided by both the oil’s viscosity and its chemical additives. The greatest need for both is in the motorcycle transmission gear set. High sliding pressures, shock loading and the shearing forces applied by the gears demand a
great deal from a lubricant. Motorcycle applications present a unique situation because many motorcycle engines share a
common lubrication sump with the transmission. The same oil lubricates both assemblies, yet engines place different
demands on the oil than do transmissions. What may work well for one may not work well for the other. In an attempt to
meet both needs, a lubricant’s performance can be compromised in both areas.
To examine gear oil performance, the ASTM test methodology D-5182 (FZG) is used. In this test, two hardened steel spur
gears are partially immersed in the oil to be tested. The oil is maintained at a constant 90° C and a predetermined load is
placed on the pinion gear. The gears are then rotated at 1,450 RPM for 21,700 revolutions. Finally, the gears are inspected for scuffing (adhesive wear). If the total width of wear on the pinion gear teeth exceeds 20 mm, the test is ended. If less
than 20 mm of wear is noted, additional load is placed on the pinion gear and the test is run for another 21,700 revolutions.
Each time additional load is added, the test oil advances to a higher stage. The highest stage is 13. Results indicate the
stage passed by each oil. Wear is reported for the stage at which the oil failed.
Results, Gear Wear Test, SAE 40 Group
Pass Example:
AMSOIL MCF
Passed Stage 13,
Total Wear 0 mm
Failure Example:
Torco T-4SR
Passed Stage 12,
Failed Stage 13,
Total Wear in
Stage 13, 320 mm
Wear Pattern
Original Machining marks
Results - Gear Wear Test, SAE 40 Group
Failed - 320mm
Failed - 32mm
Failed - 320mm
Passed all 13 Stages - 2mm Wear
Passed all 13 Stages - 0.5mm Wear
Passed all 13 Stages - 0mm Wear
Passed all 13 Stages - 0mm Wear
Passed all 13 Stages - 0mm Wear
Passed all 13 Stages - 0mm Wear
Passed all 13 Stages - 0mm Wear
Passed all 13 Stages - 0mm Wear
Passed all 13 Stages - 0mm Wear
Passed all 13 Stages - 0mm Wear
Passed all 13 Stages - 0mm Wear
to
r
C
as
tr
o
V
ic
U
4
um
M
ax
y
lR
ct
S
ro
R
R
4
P
oy
la
4T
al
ti
nu
P
ur
m
pl
S
e
X
M
4
V
ax
al
-C
vo
B
yc
lin
el
le
S
-R
e
uz
4ay
uk
S
E
t
i4
r
X
ok
S
-C
e
S
yc
up
le
e
Lu
rb
S
yn
ca
ik
e
s
R
ac
H
ig
i
ng
h
Pe
O
il
rf
or
m
an
ce
H
on
da
M
ob
H
P
il
4
R
ac
in
g
To
4T
rc
o
T
Pe
-4
S
M
nn
R
ot
zo
ul
il
30
M
ot
0
or
V
cy
cl
e
O
il
M
ax
im
a
A
M
S
O
IL
M
C
F
9
pe
10
Wear results shown in mm at last test stage passed.
S
11
ar
is
12
lt
ra
Passed all 13 Stages - 0mm Wear
Maximum Test Stage = 13
Po
l
Test Stages Passed
13
14
Results, Gear Wear Test, SAE 50 Group
Pass Example:
AMSOIL MCV
Passed Stage 13,
Total Wear 0 mm
Failure Example:
Lucas High Performance
Passed Stage 11,
Failed Stage 12,
Total Wear in
Stage 12, 160 mm
Wear Pattern
Original Machining marks
Results - Gear Wear Test, SAE 50 Group
Failed - 160 mm
Failed - 67.2 mm
Failed - 27.9 mm
Passed all 13 Stages - 14 mm
Passed all 13 Stages - 10.5 mm
Passed all 13 Stages - 0.7 mm
Passed all 13 Stages - 0.2 mm
Passed all 13 Stages - 0.2 mm
Passed all 13 Stages - 0 mm
Passed all 13 Stages - 0 mm
Passed all 13 Stages - 0 mm
Passed all 13 Stages - 0 mm
Passed all 13 Stages - 0.2 mm
10
Passed all 13 Stages - 0 mm
11
Passed all 13 Stages - 0 mm
12
Passed all 13 Stages - 0 mm
Test Stages Passed
13
Passed all 13 Stages - 0 mm
Maximum Test Stage = 13 - Wear results shown in mm at last test stage passed.
B
A
M
M
S
W
O
R
IL
M
o
ot
S
y
M
al
pe
or
C
V
P
ct
c
ur
yc
ro
pl
l
e
P
e
la
O
M
il
ti
ax
nu
-C
m
y
H
cl
ea
V
e
al
H
vy
vo
ar
-D
ke
lin
ut
ye
y
D
4av
S
S
tr
id
uz
ok
so
uk
e
n
i4
H
D
-C
36
yc
0
le
V
-T
w
H
in
on
da
M
H
ob
P
il
-4
1
M
V
-T
ax
w
im
in
a
4
C
U
as
lt
tr
ra
ol
B
V
el
-T
-R
w
in
ay
To
rc
V
H
-T
o
ar
w
V
le
in
-S
yer
D
Pe
i
av
es
nn
id
S
zo
so
S
il
n
M
S
ot
yn
or
3
cy
M
Lu
ot
cl
ca
ul
e
s
O
71
H
il
ig
00
h
E
Pe
st
rf
er
or
m
an
ce
9
The test shows that 80% of the SAE 40 oils and 83% of the SAE 50 oils passed stage 13. Because FZG and 4-Ball Wear
Tests measure wear protection differently and address different lubrication concerns within a motorcycle, it is important for
oils to obtain high scores in both tests to ensure superior protection in a variety of motorcycle applications and conditions.
Although the Torco T-4SR oil scored the best in the 4-Ball Wear Test, it failed stage 13 in the FZG Gear Wear Test.
AMSOIL motorcycle oils obtained consistently high marks in both the SAE 40 and SAE 50 4-Ball and FZG Gear Wear Tests.
15
Oxidation Stability (TFOUT ASTM D-4742)
Heat can destroy lubricants. High temperatures accelerate oxidation, which shortens the oil life and promotes carbon
deposits. Oxidized lubricants can create and react with contaminants such as fuel and water to produce corrosive by-products. Oxidation stability is critical in air-cooled and high performance motorcycles.
ASTM test methodology D-4742 is used to determine an oil’s ability to resist oxidation by exposing the oil to common conditions found in gasoline fueled engines. These conditions include the presence of fuel; metal catalysts such as iron, lead
and copper; water; oxygen and heat. Typically, the initial rate of oxidation is slow and increases with time. At a certain point,
the rate of oxidation will increase significantly. The length of time it takes to reach that level of rapid oxidation is measured
in minutes. The maximum duration of the test is 500 minutes.
185
140
180
230
196
248
275
198
311
320
215
365
296
402
Minutes to Break
410
366
500
500
455
500
500
500
500
Results - Oxidation Stability, SAE 40 Group
ke
bi
ot
ul
30
0
T
pe
or
V
co
ct
ro
T4S
P
la
R
ti
nu
V
al
m
vo
S
lin
X
4
e
4C
as
S
tr
tr
ok
ol
S
e
uz
R
S
uk
R
i4
4
4T
-C
H
on
yc
le
da
S
H
yn
P
4
R
ac
in
P
Pe
g
ol
O
ar
nn
il
is
zo
V
il
Lu
ic
M
t
ca
or
ot
or
s
y
H
cy
ig
cl
h
e
Pe
O
rf
il
or
m
an
ce
S
E
ay
S
M
up
-C
ax
S
X
e
pl
ur
-R
el
B
P
er
yc
le
4T
g
in
ac
M
R
il
ob
M
ax
R
oy
al
im
a
M
M
A
ax
M
S
um
O
4
IL
U
M
lt
C
F
50
ra
74
95
500
500
450
500
500
500
500
Results - Oxidation Stability, SAE 50 Group
142
V
-T
ax
w
im
in
P
a
ur
4
pl
U
e
lt
ra
M
ax
B
-C
el
S
yc
-R
pe
le
ay
To
ct
rc
V
ro
-T
o
P
w
V
la
in
S
ti
er
nu
ie
m
s
H
S
ea
S
M
vy
ot
ul
D
ut
71
y
00
B
E
M
st
W
e
M
r
ot
or
H
O
on
V
il
al
da
vo
H
lin
P
e
-4
4S
C
S
tr
as
uz
ok
tr
uk
e
ol
i4
V
-T
-C
Pe
w
yc
i
n
nn
le
zo
V
H
-T
il
ar
w
M
le
in
o
yto
H
D
rc
ar
av
yc
le
id
yle
s
D
on
Lu
av
ca
S
id
yn
s
so
H
3
n
ig
H
h
D
Pe
36
rf
0
or
m
an
ce
R
oy
al
M
ob
M
M
S
il
1
O
IL
M
C
V
0
A
164
50
50
147
100
184
150
194
200
231
250
250
282
300
339
350
343
380
Minutes to Break
400
The test shows that only 33% of the SAE 40 group oils and 29% of the SAE 50 group oils achieved the maximum obtainable results of 500 minutes. The results of the remaining oils suggest a faster rate of degradation and shorter service life.
16
Volatility (Evaporation) (ASTM D-5800)
When oil is heated, lighter fractions in the oil volatilize (evaporate). This leads to increased oil consumption, emissions and
viscosity increase. Higher operating temperatures produce greater volatility.
To determine an oil’s resistance to volatility, ASTM test methodology D-5800 is used. In this test, a specific volume of oil is
heated to a temperature of 250° C for a period of 60 minutes. Air is drawn through the container holding the oil sample,
removing oil that has turned into vapor. At the end of the 60-minute period, the remaining oil volume is weighed and compared to the original weight of the sample. The difference is reported as the percentage of weight lost.
Results - Volatility, SAE 40 Group
15.18%
-C
an
ax
m
e
pl
ur
P
h
ig
H
s
ce
il
O
cy
cl
e
Pe
r
or
4-
ot
lM
nz
oi
ca
Lu
M
13.50%
12.07%
tr
S
in
ac
e
in
vo
l
V
al
Pe
n
S
uz
uk
i4
ok
e
11.77%
il
O
g
bi
er
up
R
S
yc
le
-R
-C
el
B
yn
S
X
E
ay
a
im
ke
9.91%
4
P
H
da
on
S
9.59%
U
4
T4S
R
H
ra
lt
4T
4
R
S
R
um
M
ax
ol
tr
as
C
ax
M
S
To
rc
o
6.44%
0
ot
ul
30
M
IL
S
O
M
is
M
ar
Po
l
V
F
5.89%
C
ry
to
V
in
m
ac
nu
R
il
la
ti
P
ob
M
ro
pe
ct
ic
g
S
X
4
0%
A
2%
4T
4.47%
4%
5.51%
6%
8.28%
8%
9.57%
10%
11.76%
12%
fo
r
14%
R
oy
al
Percent Loss
16%
yc
le
18.44%
18%
18.68%
20%
Results - Volatility, SAE 50 Group
11.91%
11.43%
10.72%
9.77%
9.32%
8.50%
8.33%
8.07%
6.56%
6.38%
4.57%
4.51%
ul
H
P
la
71
-4
ti
00
nu
E
m
s
te
H
ea
To
r
vy
rc
o
D
V
ut
-S
y
er
B
ie
M
s
W
S
S
M
H
ot
ar
M
or
ob
le
O
yil
il
D
1
av
V
-T
id
w
so
V
i
n
n
al
H
vo
H
D
lin
ar
36
le
e
0
y4D
S
av
tr
ok
id
so
e
n
M
S
S
a
yn
uz
xi
m
uk
3
a
i4
4
-C
U
lt
yc
r
a
le
R
B
V
oy
el
-T
-R
w
al
in
ay
P
Lu
ur
V
pl
ca
-T
e
w
s
M
in
H
ax
ig
h
-C
P
y
Pe
er
cl
e
fo
nn
rm
zo
an
il
M
c
e
ot
or
cy
cl
e
da
on
S
pe
ct
ro
P
M
ot
ol
tr
M
C
A
as
S
O
IL
M
C
V
0%
H
2%
in
3.89%
4%
4.49%
6%
6.31%
8%
7.83%
10%
V
-T
w
Percent Loss
12%
11.74%
14%
The results show a significant difference between those oils with low volatility and those with higher volatility. Low volatility
is of particular benefit in hot running, air-cooled engines.
17
Acid Neutralization and Engine Cleanliness (TBN ASTM D-2896)
Motor oils are designed to neutralize acids and keep engines clean. Both tasks can be accomplished, in part, through the
use of detergent additives, as they are alkaline in nature. Alkalinity is measured using ASTM D-2896. Reported as a Total
Base Number (TBN), the test determines the amount of acid required to neutralize the oil’s alkaline properties. The higher
the result, the greater amount of acid the oil can withstand.
Detergent additives are sacrificial and are depleted as they neutralize acids. Therefore, oils with a higher TBN should provide benefits over a longer period of time.
Results - TBN & Cleanliness, SAE 40 Group
7.75
8.15
8.24
8.53
8
8.63
8.68
8.83
9
8.99
9.32
10.01
10
10.25
10.37
11.10
11
11.18
11.44
12
bi
er
up
S
S
or
-R
ay
E
X
ot
lM
el
B
nz
oi
ke
il
cy
cl
e
O
g
in
ac
ul
R
ot
yn
S
yc
le
Pe
n
-C
S
uz
uk
i4
O
il
V
30
to
ic
V
is
M
ct
pe
S
ax
M
0
ry
4
S
Po
l
P
ro
ar
nu
da
la
ti
on
m
H
P
X
4
ok
e
e
H
in
vo
l
M
4-
co
S
tr
T4
S
R
4T
ob
il
To
r
R
R
S
ac
R
in
4
g
4T
ra
V
al
im
C
a
as
M
tr
ax
M
A
P
ol
S
um
O
4
IL
U
M
lt
C
F
yc
le
-C
pl
ur
h
ig
H
s
R
oy
al
ca
Lu
M
e
Pe
r
fo
r
ax
m
an
6
ce
7
Results - TBN & Cleanliness, SAE 50 Group
as
yc
le
4
a
im
C
-C
P
ct
ro
pe
uk
uz
S
7.27
7.77
8.09
8.17
8.26
8.36
lt
ra
V
-T
w
la
tr
in
ti
ol
nu
V
-T
m
Pe
w
H
in
ea
nn
Lu
vy
zo
ca
il
D
s
ut
M
H
ot
y
ig
or
h
cy
Pe
cl
rf
e
or
M
ot
m
an
ul
ce
71
00
H
ar
E
le
st
H
yer
on
D
da
av
id
H
so
P
-4
V
n
al
H
vo
D
lin
36
e
0
4B
S
el
tr
-R
ok
ay
e
V
-T
w
in
S
S
U
s
ax
i4
S
in
ie
er
1
il
ob
To
r
co
V
-S
ot
M
M
il
O
or
M
IL
B
M
W
M
O
S
M
A
V
-T
w
C
3
yn
S
so
n
av
id
D
y-
le
ar
H
R
oy
al
P
ur
pl
e
M
ax
-C
yc
le
6
V
7
8.48
8
8.69
8.87
9
9.02
9.26
10
8.90
10.42
11.05
11.10
11.15
11
11.23
12
18
Only AMSOIL had oils in both the SAE 40 and SAE 50 groups that
exhibited zero mL foam after the five-minute bubbling process.
Pass Example:
AMSOIL MCV
(0-0-0)
Fail Example:
Lucas High
Performance
(500-555-510)
Higher operating speeds and gear systems in
motorcycles increase the need for good foam
control. While oil cannot prevent the introduction of air, it can control foaming through the
use of anti-foam additives.
Results - Foaming Tendency, SAE 40 Group
- Sequence II
- Sequence III
10-200
10200-10
-10
300
250
200
20-30
20
30-20
-20
5-60
60-0
-0
5-50
50-0
-0
0-30
30-0
-0
0-30
30-0
-0
0-20
20-0
-0
P
ro
S
im
ct
ax
pe
M
S
-C
S
uz
uk
i4
nu
m
S
To
X
4
rc
o
a
TM
4S
ax
R
um
4
Pe
U
l
nn
tr
M
a
ot
zo
ul
il
Lu
M
30
ot
ca
0
or
V
s
cy
H
ig
cl
h
e
R
Pe
O
oy
il
rf
al
or
P
m
ur
a
pl
B
nc
el
e
e
-R
M
ax
ay
-C
E
X
yc
S
le
S
up
er
bi
ke
0-20
20-0
-0
il
H
da
la
ti
on
ac
H
R
4-
P
O
g
in
tr
S
R
S
R
e
in
vo
l
yc
le
V
al
4
0-20
20-0
-0
0-20
20-0
-0
ok
e
4T
4
g
in
ac
R
ol
tr
as
C
M
yn
0-0-0
-0
4T
0-0-0
-0
il
ob
Po
l
A
M
ar
S
is
O
V
IL
ic
M
to
C
ry
F
0
0-20
20-0
-0
100
0-50
50-0
-0
150
50
The results show the levels of foam present for
each sequence immediately following the fiveminute bubbling process. In the SAE 40 group,
Pennzoil Motorcycle Oil, Lucas High
Performance, Royal Purple Max-Cycle and BelRay EXS Superbike failed to meet the foaming
requirements of JASO T903:2006 and ISO
24254:2007, which specify a minimum standard of 10/50/10. In the SAE 50 group, Motul
7100 Ester, Bel-Ray V-Twin and Lucas High
Performance failed to meet the standards.
265-200
265200-190
-190
- Sequence I
Foam Volume (mL)
Results - Foaming Tendency, SAE 50 Group
- Sequence II
- Sequence III
275-300
275300-200
-200
Foam Volume (mL)
600
500
400
H
in
vo
l
V
al
le
ar
H
m
nu
5-100
100-0
-0
0-50
50-0
-0
5-45
45-0
-0
0-40
40-0
-0
0-20
20-0
-0
0-10
10-0
-0
0-10
10-0
-0
0-0-0
-0
P
ea
4
vy
D
u
yty
e
D
4av
S
S
tr
id
uz
ok
so
uk
e
n
i4
H
D
-C
30
yc
0
le
M
V
-T
ax
w
im
i
n
a
4
C
as
U
Pe
lt
tr
ra
ol
nn
V
zo
-T
il
w
M
in
ot
To
or
rc
cy
o
cl
V
-S
e
M
er
ot
ie
ul
s
71
S
S
00
Lu
B
E
ca
el
st
-R
s
er
ay
H
ig
V
h
-T
Pe
w
rf
in
or
m
an
ce
0-0-0
-0
yn
H
H
on
da
S
on
ds
P
la
ti
ro
ct
pe
S
19
3
0-0-0
-0
O
il
0-0-0
-0
or
C
yc
le
M
ot
W
M
B
le
y
ar
H
e
pl
-D
av
i
M
ax
il
ob
M
P
ur
A
M
S
1
O
IL
M
V
-T
w
C
V
0
in
0-0-0
-0
100
0-0-0
-0
200
10-40
10
40-10
-10
300
500-555
500555-510
-510
- Sequence I
R
oy
al
To determine foaming characteristics, ASTM
test methodology D-892 is used. The testing is
divided into three individual sequences. In each
sequence, air is bubbled through the oil for five
minutes and the foam generated is measured in
millimeters immediately following the test. At the
end of the sequence, the oil is allowed to settle
for 10 minutes and the remaining foam is measured again. Both results are reported. The temperature is altered for each sequence.
Sequence I is conducted at 24° C, Sequence II
at 93.5° C and Sequence III after allowing the
oil to cool back to 24° C.
0-10
10-0
-0
Foaming Tendency (ASTM D-892)
During engine and transmission operation, air
is introduced into the lubricating oil, which may
produce foam. In severe cases, foam can
increase wear, operating temperatures and
oxidation. Oil is non-compressible, but when
air passes through loaded areas, the bubbles
can collapse and allow the metal surfaces to
contact each other. In addition, the oil has a
larger surface area exposed to oxygen when
air is trapped in the oil, which promotes
increased oxidation.
Rust Protection (Humidity Cabinet ASTM D-1748)
Rust protection is of particular importance in motorcycle applications. Motorcycles are typically not used every day and are
often stored during the off-season. Condensation and moisture within the engine can cause rust. Rust is very abrasive and
leaves pits in metal surfaces. Rust rapidly accelerates wear and can cause catastrophic failure. Roller bearings are especially sensitive to rust. Oil, however, has little or no natural ability to prevent rust. General engine oil additives may provide
some degree of rust protection, but for superior anti-rust properties, rust inhibitors must be added.
Rust protection is measured using the ASTM D-1748 humidity cabinet test. The procedure calls for metal coupons to be
dipped in the test oil, then placed in a humidity cabinet for 24 hours at 48.9° C. After 24 hours, the coupons are removed
and inspected for rust. Oils allowing no rust or no more than three rust spots less than or equal to 1 mm in diameter are
determined to have passed. Oils allowing more than three rust spots or one rust spot greater than 1 mm in diameter are
determined to have failed. The degree of failure has been divided into three additional categories: 1-10 spots, 11-20 spots
and 21 or more spots.
Results, Rust Protection, SAE 40 Group
Pass Example: AMSOIL MCF
Fail Example: Castrol RS R4 4T
Results - Rust Protection, SAE 40 Group
10.0 = PASS
10.0 = PASS
10.0 = PASS
10.0 = PASS
= 21+ - Rust Spot Heavy
4
2
nz
M
ax
oi
lM
-C
yc
ot
le
S
or
uz
V
cy
al
uk
cl
vo
i4
e
lin
O
-C
il
e
yc
4le
S
tr
S
yn
ok
e
R
ac
in
g
B
el
O
H
il
-R
on
ay
da
E
H
X
S
P
S
pe
4
S
ct
up
ro
er
bi
P
la
ke
ti
nu
C
m
as
S
tr
X
ol
4
R
S
R
4
4T
y
T4S
R
or
ic
t
Pe
n
P
ur
pl
e
V
s
ar
i
To
rc
o
V
in
g
ac
Po
l
ob
i
lR
ot
ul
30
0
U
4
M
4T
R
oy
al
a
M
M
ax
um
m
fo
r
ax
im
M
ca
s
H
ig
h
A
Pe
r
M
S
O
IL
M
C
an
ce
F
0
lt
ra
1
2.5 = FAIL
5.0 = FAIL
5
2.5 = FAIL
6
3
Lu
= 11-20 - Rust Spot Medium
10.0 = PASS
10.0 = PASS
10.0 = PASS
7
10.0 = PASS
Rating Scale
8
10.0 = PASS
9
10.0 = PASS
10.0 = PASS
10
= 1-10 - Rust Spot Light
10.0 = PASS
= 0 - Rust Spot Clean
20
21
ay
a
im
ul
co
T4
S
R
ke
ra
bi
lt
U
er
up
4
.22
.22
.22
.42
.39
.37
.34
.33
.32
.29
.28
.26
$0.40
To
r
S
um
4T
V
yc
le
-C
ax
g
0
4
S
X
30
in
R
ac
M
S
X
E
ax
e
pl
M
ur
P
-R
B
el
ax
M
il
ob
M
m
nu
ot
M
C
F
M
4T
4
ry
P
4
R
IL
O
S
S
H
il
ce
to
ic
da
R
la
ti
P
M
A
ol
V
O
.11
$0.30
R
oy
al
ro
ct
pe
tr
on
is
g
an
m
ok
e
$0.20
H
fo
r
in
ac
R
Pe
r
yn
.09
.46
5.0 = FAIL
3
Po
la
r
ig
h
il
O
4
C
as
H
tr
S
4-
7.5 = FAIL
7.5 = FAIL
7.5 = FAIL
Pass Example: AMSOIL MCV
S
s
ca
e
in
cy
cl
e
$0.10
S
or
$0.00
yc
le
-C
vo
l
V
al
7.5 = FAIL
10.0 = PASS
10.0 = PASS
10.0 = PASS
10.0 = PASS
10.0 = PASS
10.0 = PASS
10.0 = PASS
10.0 = PASS
10.0 = PASS
= 11-20 - Rust Spot Medium
Lu
i4
uk
uz
S
ot
Pricing
Performance is not all that is considered when
making a motorcycle oil purchase. The consumer will wish to optimize the performance of
the product as compared to the price. In this
evaluation the price of the candidate oils were
compared on a cost per ounce basis, equalizing the differences between quart and liter volumes. Prices are based on the actual cost paid
for the product when purchased in case lots.
lM
H
5
nz
oi
V
al
6
Cost Per Ounce
yc
le
-C
10.0 = PASS
10.0 = PASS
= 1-10 - Rust Spot Light
Pe
n
m
M
ce
-4
P
H
an
m
ax
M
W
M
B
e
pl
nu
la
ti
P
ur
fo
r
Pe
r
10.0 = PASS
= 0 - Rust Spot Clean
ot
or
O
ea
il
v
vo
y
H
lin
D
ar
u
le
e
ty
y4D
S
av
tr
ok
id
e
so
To
n
rc
S
o
y
V
n
-S
3
M
er
ot
ie
S
ul
s
uz
S
71
uk
S
00
i4
H
ar
-C
E
st
le
yc
er
yl
e
D
V
av
T
id
w
Pe
so
in
nn
n
H
zo
D
il
36
M
0
ot
B
or
el
cy
-R
cl
ay
e
M
V
-T
ax
w
im
in
a
4
C
U
as
lt
tr
ra
ol
V
-T
w
in
ro
ct
pe
S
h
da
in
V
0
on
C
7
V
-T
w
8
H
1
Rating Scale
9
P
ig
H
il
M
10
R
oy
al
s
ca
Lu
IL
O
S
M
ob
A
M
Results, Rust Protection, SAE 50 Group
Fail Example: Castrol V-Twin
Results - Rust Protection, SAE 50 Group
= 21+ - Rust Spot Heavy
2
1
Results - Pricing, SAE 40 Group
$0.50
Results - Pricing, SAE 50 Group
.37
.34
.33
.31
.28
.26
.47
.46
.19
Pe
M
C
rf
V
or
D
m
av
an
P
id
la
c
s
e
ti
on
nu
m
S
yn
H
ea
3
vy
R
M
oy
ob
D
al
ut
il
y
P
1
ur
V
pl
-T
e
w
M
in
ax
M
-C
ax
yc
im
le
a
4
B
M
U
lt
W
ra
To
M
ot
rc
or
o
V
O
-S
il
er
B
ie
el
s
-R
S
ay
S
V
-T
w
in
S
M
S
pe
ct
ro
H
ar
le
y-
h
A
H
ig
Lu
ca
s
M
ot
ul
71
00
O
IL
E
st
er
-4
da
H
P
in
H
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$0.10
.11
.15
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$0.20
.30
$0.30
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Cost Per Ounce
$0.40
.39
.45
$0.50
Although the initial price of a product is a primary concern, it does not reflect the actual cost of using the product. Less
expensive oils may save money initially but can cost more in the end if they compromise performance. The additional benefits offered by a more expensive oil can offset the difference in price. For example, oils that last longer cost less over time,
and oils that offer superior anti-wear performance and rust protection can increase equipment life, reducing expensive
repairs. High quality motorcycle oil is an inexpensive way to protect an expensive investment.
Wet-Clutch Compatibility (JASO T 904:2006, ISO 24254:2007 limited review)
It has been noted that motorcycle oils must be multi-functional, meeting the needs of both the engine and transmission. An
additional concern is in those applications in which the clutch is immersed in the oil occupying the transmission. As the
clutch is a frictional device and oils are by design used to minimize friction, concern arises over the impact the oil may have
on the operation of the clutch. How an oil performs in a wet-clutch application is, in part, a function of its additive system.
An oil should be free of additives such as friction modifiers that can dramatically alter the dynamic and static frictional properties of the clutch and result in clutch plate slippage.
Wet-clutch compatibility is determined using JASO T 904:2006 test methodology, which is a subsection of JASO T
903:2006. Identical test methodology is also found in ISO standard 24254:2007. These procedures determine the frictional characteristics of an oil and allow comparison against a standard. That standard has four categories: JASO MB, MA,
MA1, MA2 and ISO L-EMB, L-EMA, L-EMA1 and L-EMA2. Oils falling into the MB (L-EMB) category offer minimal wetclutch performance, while MA2 (L-EMA2) fluids offer the best performance to help prevent clutch plate slippage.
The scope of this paper did not allow for the evaluation of all oils in this area. As such, results of the oils tested were not
included within the overall product summary. Testing revealed the AMSOIL motorcycle oils meet the highest rating of JASO
MA2 (L-EMA2), offering superior wet-clutch performance. Motul and Royal Purple meet the JASO MA specification, the minimum standard specified by most motorcycle manufacturers. Although both Maxima and Torco claim to meet the JASO MA
specification, testing shows Maxima only qualifies as a JASO MB oil, while Torco does not qualify for a JASO category at all.
Results, Wet-Clutch Compatibility
AMSOIL MCF 10W-40
AMSOIL MCV 20W-50
Motul 300V 10W-40
Royal Purple 10W-40
Maxima Maxum 4 Ultra 5W-40
Torco T-4SR 10W-40
Dynamic
Friction Index
2.03
2.07
2.07
1.54
Static Friction
Index
1.94
1.95
1.63
1.87
Stop Time
Index
1.99
1.98
1.98
1.58
JASO
Category
MA2
MA2
MA
MA
JASO Category
Advertised
MA2
MA2
MA
None
ISO
Category
L-EMA2
L-EMA2
L-EMA
L-EMA
1.46
1.10
1.28
0.57
1.53
1.08
MB
None
MA
MA
L-EMB
None
22
AMSOIL MCF
Mobil Racing 4T
Maxima Maxum 4 Ultra
Polaris Victory
Valvoline 4-Stroke
Motul 300 V
Castrol RS R4 4T
Suzuki 4-Cycle Syn Racing
Spectro Platinum SX4
Lucas High Performance
Torco T-4SR
Honda HP 4
Bel Ray EXS Super Bike
Royal Purple Max-Cycle
Pennzoil Motorcycle Oil
Scoring and Summary of Results
Each oil was assigned a score for each test result. The oil with the best test result was assigned a 1. The oil with the second
best result was assigned a 2, and so on. Oils demonstrating the same level of performance were assigned the same number. Note that the results of each test have not been weighted to reflect or suggest the degree of significance it represents
in a motorcycle application. The degree of significance will vary between individual applications and by consumer perception.
As oils must perform a number of tasks, results in all categories were added together to produce an overall total for each oil.
The oil with the lowest total is the overall highest performer.
8
13
5
15
12
7
3
11
6
2
4
14
1
9
9
1
5
4
6
13
2
3
10
8
14
15
11
7
12
9
1
7
9
3
4
2
14
6
5
10
7
14
11
11
13
Wear Protection (4-Ball ASTM D-4172)
2
6
4
13
7
5
14
9
12
8
1
11
3
15
10
Gear Performance (FZG ASTM D-5182)
1
1
1
1
1
14
1
1
1
1
13
1
1
1
15
Oxidation Stability (TFOUT ASTM D-4742)
1
1
1
13
9
6
10
12
8
15
7
11
1
1
14
Volatility (NOACK ASTM D-5800)
4
2
7
3
12
5
6
11
1
14
8
9
10
15
13
Acid Neutralization (TBN ASTM D-2896)
3
6
4
11
8
12
5
13
10
1
7
9
15
2
14
SAE 40 - PRODUCT
COMPARISON RESULTS
Viscosity Index (ASTM D-2270)
Foam Control (ASTM D-892)
1
3
10
1
3
11
3
3
8
13
8
3
15
14
12
Rust Protection (Humidity Cabinet ASTM D1748)
1
1
1
1
1
1
14
1
14
1
1
1
13
1
1
Pricing
8
11
13
3
2
10
7
3
9
3
15
6
14
12
1
TOTALS
32
56
59
70
72
75
80
80
82
82
86
90
91
93
111
Ranking
1
2
3
4
5
6
7
7
9
9
AMSOIL MCF
Mobil Racing 4T
Maxima Maxum 4 Ultra
Polaris Victory
Valvoline 4-Stroke
Motul 300 V
Castrol RS R4 4T
Suzuki 4-Cycle Syn Racing
Spectro Platinum SX4
Lucas High Performance
Viscosity Shear Stability (% Viscosity
Retention after 90 cycles, ASTM D-6278)
High Temperature / High Shear Viscosity
(HT/HS ASTM D-4683)
23
Pennzoil Motorcycle Oil
Royal Purple Max-Cycle
Bel Ray EXS Super Bike
Honda HP 4
Torco T-4SR
11 12 13 14 15
AMSOIL MCV
Mobil 1 V-Twin
Torco V-Series SS
Harley Davidson
SYN 3
Spectro Platinum HD
BMW Motor Oil
Maxima 4 Ultra
Royal Purple Max-Cycle
Honda HP 4
Suzuki 4-Cycle V-Twin
Valvoline 4-Stroke
Motul 7100 Ester
Bel-Ray V-Twin
Castrol V-Twin
Harley Davidson HD 360
Lucas High Performance
Pennzoil Motorcycle Oil
7
10
9
6
8
3
2
11
14
14
16
5
1
16
13
3
12
2
1
4
12
6
8
5
16
9
10
13
3
7
15
17
14
11
3
2
1
4
6
11
12
5
16
7
10
12
17
14
7
9
14
Wear Protection (4-Ball ASTM D-4172)
2
3
1
5
10
16
4
17
11
13
8
14
7
12
15
9
6
Gear Performance (FZG ASTM D-5182)
1
1
1
1
1
1
1
1
1
1
1
16
1
1
1
16
15
Oxidation Stability (TFOUT ASTM D-4742)
1
1
6
15
7
9
1
1
10
13
11
8
1
12
16
17
14
Volatility (NOACK ASTM D-5800)
1
8
6
11
5
7
12
15
3
13
10
4
14
2
9
16
17
Acid Neutralization (TBN ASTM D-2896)
3
5
6
2
10
4
7
1
14
8
16
13
17
9
15
12
11
Foam Control (ASTM D-892)
1
1
14
1
7
1
11
1
1
10
7
15
16
12
7
17
13
Rust Protection (Humidity Cabinet ASTM D-1748)
1
1
1
1
1
1
13
1
1
1
1
1
13
17
13
1
13
Pricing
8
12
16
10
11
15
14
13
6
4
2
7
17
5
3
8
1
TOTALS
30
45
65
68
72
76
82
82
86
92
95
98
111
115
116
122
127
Ranking
1
2
3
4
5
6
7
7
9
AMSOIL MCV
Mobil 1 V-Twin
Torco V-Series SS
Harley Davidson
SYN 3
Spectro Platinum HD
BMW Motor Oil
Maxima 4 Ultra
Royal Purple Max-Cycle
Honda HP 4
24
Pennzoil Motorcycle Oil
Lucas High Performance
Harley Davidson HD 360
Castrol V-Twin
Bel-Ray V-Twin
Motul 7100 Ester
10 11 12 13 14 15 16 17
Valvoline 4-Stroke
Viscosity Index (ASTM D-2270)
Viscosity Shear Stability (% Viscosity Retention after 90
Cycles, ASTM D-6278
High Temperature / High Shear Viscosity (HT/HS
ASTM D-4683)
Suzuki 4-Cycle V-Twin
SAE 50 - PRODUCT
COMPARISON RESULTS
Conclusion
The intent of this document is to provide scientific data on the performance of motorcycle oils and information on their
intended applications. The document also attempts to dismiss several rumors or mistruths common to motorcycle oils. In
doing so, it will assist the reader in making an informed decision when selecting a motorcycle oil.
The tests conducted are intended to measure variables of lubrication critical to motorcycles, with some having much greater
value than others. Gear and general anti-wear protection, oxidation stability and rust protection are the most important, with
zinc content being among the least important. The results were not weighted based on importance. The value of each test
is to be determined by the reader.
The data presented serves as predictors of actual service; the better the score, the better the performance. AMSOIL MCF
and MCV demonstrated superior performance, particularly in the most important areas, and each ranked first overall in its
respective category. It should be noted that the performance of a given manufacturer’s oils was not always consistent
between viscosities.
The results suggest a relationship between the cost of an oil and its level of performance. Generally, higher priced oils tend
to perform better, although price alone is not a guarantee of performance. Bel-Ray V-Twin was the most costly oil tested,
yet many lower priced oils showed better performance. Price must be put into perspective. The cost of oil compared to the
cost of a motorcycle is minimal. The cost difference between the average price for motorcycle oils and the most expensive
oils is less than $15 per oil change. If the performance of an oil can support an extended oil change interval, that cost is
reduced. The consumer must consider the performance and benefits offered by an oil and how those benefits affect their
motorcycle investment to determine the oil’s value.
In conclusion, maximum performance and cost effectiveness are obtained when one looks beyond marketing claims and
selects a product based on the data that supports it.
25
26
References
1. SAE Viscosity Grades for Engine Oils - SAE J300 Nov 07
2. JASO T 903:2006
3. JASO T 904:2006
4. ISO 24254:2007
5. ASTM Test Methodology Designation: D 892-03
6. ASTM Test Methodology Designation: D 1748-00
7. ASTM Test Methodology Designation: D 2270-04
8. ASTM Test Methodology Designation: D 2896-03
9. ASTM Test Methodology Designation: D 4172-94 (Reapproved 2004)
10. ASTM Test Methodology Designation: D 4742-02a
11. ASTM Test Methodology Designation: D 5182-97 (Reapproved 2002)
12. ASTM Test Methodology Designation: D 5481-04
13. ASTM Test Methodology Designation: D 5800-00a
14. ASTM Test Methodology Designation: D 6278-02
27
G2156 6-09