BAR’S LEAKS TECHNICAL BULLETIN
ISO 9001 CERTIFIED
Tech Bulletin #: TB-MS-1
Date 1st Issued: March 18, 2016
Bar’s Leaks Main Seal Motor Oil Leak Repair
Page 1 of 2
Date Revised: July 28, 2016
Part #: MS-1
MAIN SEAL™
MOTOR OIL LEAK REPAIR
Bar’s Leaks® Main Seal™ Motor Oil Leak Repair is the fastest,
safest way to solve your vehicles oil leaks. Your vehicle is a
good candidate for this solution if it does not leak more than
one quart of oil per day. Depending on the severity of the leak
the first thing you will notice is dark brown spots underneath
the front of the vehicle. The oil level will also decrease and if
left long enough the oil pressure will drop and/or oil light will
come on. Use with all types of motor oil, including regular
petroleum, high mileage, synthetic blends and fully synthetic.
Can be used to top off oil when low, or to replace a quart of
oil when performing an oil change. Works with ALL gasoline
and diesel engines.
 Guaranteed to:
o Repair Leaking Front & Rear Main Seals
o Stop Cam & Timing Seal Leaks
o Seal All Other Oil Leaks
 Reinforced with Synthetic Polymers
 One Dosage Stops All Engine Oil Leaks Guaranteed
 Safe & Easy to Use, and Works Quickly
 Best Stop Leak Formula Money Can Buy
 Synthetic Blend, for All Engines
INSTRUCTIONS:
1) Turn engine off.
2) Shake well. Remove the oil fill cap and pour
Main Seal Motor Oil Leak Repair into engine
per dosage chart. Do not overfill. Reinstall cap.
3) Drive/idle engine for at least 15 minutes to mix
thoroughly with oil and activate product to start
working.
4) Top off engine (add oil as needed) and leave
Bar’s Leaks Main Seal Motor Oil Leak Repair
in the system for continued protection. Drive
vehicle as normal. Most main seal issues are
corrected in 250 miles or 3 days of driving. For
best results use with every other oil change.
Part Number: MS-1
Bottle Size: 32 FL OZ (946 mL)
DOSAGE:
One bottle treats oil capacity from 5
quarts (4.7 liters) to 7 quarts (6.6
liters).
Use ½ bottle for oil capacity from 3.5
quarts (3.3 liters) to 4.9 quarts (4.6
liters).
For larger systems use 1 bottle for
every 6 quarts.
In small engines ATV, motorcycle
(including wet clutch), lawn
equipment, tractors, etc use
approximately 5 ounces of Main Seal
to every quart of oil capacity.
Bar’s Products, 10386 N. Holly Rd., Holly MI 48442 USA
E-mail: info@barsleaks.com Web: www.barsleaks.com Phone: (800)345-6572
Main Seal Motor Oil Leak Repair Continued
Page |2
THE BEST MAIN SEAL OIL LEAK REPAIR MONEY CAN BUY
Engine seals harden and shrink from the plasticizers being removed over time. This
professional strength synthetic stop leak revitalizes these worn seals and gaskets to
restore them to like new performance. The strongest formula to stop main seal, timing
cover seal, cam seals, crankshaft seal, oil pan, valve cover and all other oil leaks. WORKS ON ALL:
- 4, 5, 6, 8, 10 Cylinders
- Synthetic and Petroleum Oil
- Cars, Trucks, Vans and SUV’s
SAFE TO USE ON:
- Gasoline Engines
- Diesel Engines
- Turbocharged Engines
- Racing Engines
What is Your Engine
Problem?
Product Selector Small Leaks – Need to add Oil 1X per Month Medium Leaks ‐ Need to add Oil 1x per Week Large Leaks – Need to add Oil 1x per Day 


Rear Main Seal 
Front Seal 
Timing Cover Leaks 
Cam Seals 
High Mileage 
Low Oil Warning Light 
Gaskets 
LIMITED LIFETIME WARRANTY
Bar’s Leaks® warrants this product to effectively stop oil
leak issues caused by seal problems while Main SealTM is
in the engine. If the oil leak issue recurs while the product
is in the vehicle, Bar’s Leaks will refund the purchase price
of the product or send a replacement product. To make a
claim under this warranty, send your full contact
information, including mailing address, in accordance with
one of the following two options:
1) ONE-TIME PRODUCT REPLACEMENT.
Send original dated sales receipt and original UPC
code showing proof of purchase, requesting
product replacement. OR
2) REFUND OF PURCHASE PRICE.
Send a written, dated verification from a licensed
repair facility confirming the diagnosis of the oil leak
issue requesting refund, together with the original
sales receipt and original UPC code showing proof
of purchase.
Mail to:
Bar’s Products Warranty Dept.
PO Box 187, Holly MI 48442
Allow 2 to 4 weeks for processing. All other
warranties, express or implied, are excluded under
this warranty to the extent permitted by law. This
warranty does not apply to products that have been
modified or improperly used.
TIP (for vehicles with known oil consumption problems):
 Check your oil level frequently – weekly or at every fill up.
 Never over fill the engine crankcase.
 Never let oil level get below recommended levels.
 Change your oil based on OE owner’s manual recommendations.
Bar’s Products, 10386 N. Holly Rd., Holly MI 48442 USA
E-mail: info@barsleaks.com Web: www.barsleaks.com Phone: (800)345-6572