Advance Auto Parts Logo
Choose a Store
  • Shop All
  • Replacement Parts
  • Performance Parts
  • Accessories
  • Oil & Fluids
  • Special Offers
  • Advance Rewards
  • Advice & How-Tos
  • Project Guides
  • FAQ / Help Desk
Loading...
Share
Product thumb
Product thumb
Product thumb
Product main large

Bar's Leaks Rear Main Seal Repair Heavy Duty Formula, 16.9 oz.

(33 reviews)
Part # 1040
30 day replacement if defective
Loading...
How Would You Like To Get This Item?

Store Pickup

Loading...Loading...Loading...

Same Day Home Delivery

Loading...Loading...Loading...

Home Delivery

Loading...Loading...Loading...
Loading...
Loading...
Loading...Loading...Loading...Loading...Loading...

Product Information

Product Details
Part No. 1040
Warranty Details (30 DAY REPLACEMENT IF DEFECTIVE)
Bar's Leaks Rear Main Seal Repair restores the seal to like new condition and contains additives to stop leaks in severely worn seals and crankshafts.

Product Features:
  • Seals Timing Covers
  • Seals Cam Seals
  • Seals Rear Main Seals
Specifications
Base Stock:
Severly Hydrotreated Heavy Petroleum Oil

Diesel Compatible:
No

Flash Point:
221 °C

Intended Treatment Result:
Stop Leak

Kinematic Viscosity at 100 Degrees Celsius:
173.3 mm 2/S

Kinematic Viscosity at 40 Degrees Celsius:
173.3 mm 2/S

Oil Quantity Treated:
6 qt (US)

Pour Point:
-27 °C

Recommended Interval:
12000

Stops Leaks:
Yes

Synthetic Oil Compatible:
Yes

Viscosity Index:
83
Loading...
Loading...Loading...Loading...Loading...Loading...
3.94 out of 5
33 Customer Reviews
67% of respondents would recommend this to a friend
Ratings Distribution
5 Stars
19
4 Stars
6
3 Stars
1
2 Stars
1
1 Star
6
Pros
5
Safe
4
Runs Clean
3
Improves Vehicle Performance
3
Reduces Wear
1
Repaired Rear Main Seal
Cons
23
No
2
Doesn't Work
1
So Far None
1
Gradual
1
Yes
Most Liked Positive Review
Stopped Rear Main Seal Leak Completely!
I have 1994 Toyota Camry, and it had very server leak. I am not a mechanic, but like to learn how to repair and maintain my cars. After fixed oil pan leaks for several times, the leak kept coming back between the end of oil pan and transmission area, and then led me to believe that it was not just the oil pan leak. It must leaked from somewhere else. After detected the server leak source from the rear main seal, decided giving a try with this Bars Rear Main Seal Repair instead of spending thousand dollars to have a mechanic repaired it. After added it to the engine and drove a car for about 100 miles, found the product working. It stops the leak completely, even stops the leaks from the other sources. My car looks cleaner, running smoother and quieter, and found no oil dropping on the ground any more. Thanks for great product and saved me thousand dollars of repair, and will continue to use it as product recommendation and as long as SAVE ME MONEY!
Most Liked Negative Review
Works a little, but buy AT-205 instead if you want it fixed.
Had a leaky Rear Main Seal on a 1994 Volvo 850. Car ran and drove great, but not worth the $ to pull the engine and tranny to replace the RMS. I put bottle after bottle of "Bar's Leaks Rear Main Seal Repair" in it. It slowed down somewhat, but definitely not a fix. The a mechanic friend recommended another product called AT-205. Picked up a bottle of AT-205 and dumped it in. 3hrs of runtime later, not a drop of oil everywhere. No observed negative effects, and we've been running for 6 weeks now. Amazing........this stuff saved us from junking the car! Don't waste your $ on this....buy AT-205 instead.
Loading...
Loading...Loading...Loading...Loading...Loading...
No results
Loading...
Loading...Loading...Loading...Loading...Loading...
Feedback

Order Lookup

Help Desk

Store Locator

In Store Services

Mobile App

© 2026 Advance Auto Parts
Privacy Policy
Terms of Use
Site Map
ADVANCING A WORLD IN MOTION®