1040 PNG

Concentrated Rear Main Seal Repair

What it's for:
  • Engine
  • Low Levels
What it does:
  • Repairs
  • Stops Leaks
  • Stops All Oil Leaks
  • Seals Rear Main, Cam Seal and Timing Cover Leaks
  • Restores Shrunk and Hardened Seals
  • Use in Gasoline & Diesel Engines
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Have you noticed oil leaking from your car lately? That might be due to worn or dried seals. There’s no need to worry or spend your money on a costly repair bill, however. Our Bar’s Leaks Concentrated Rear Main Seal Repair quickly and safely restores those seals so you can get back on the road and back to your life.

Most rear main seal leaks are caused by a combination of normal wear in the crankshaft and seal and the drying, hardening and shrinking of the main seal. Bar’s Leaks Concentrated Rear Main Seal Repair restores the seal to like-new condition and also contains additives to stop leaks in severely worn seals and crankshafts. Not to mention, it works with ALL gasoline and diesel engines using conventional, high mileage and synthetic oil.

You can trust that our products are the fastest, safest way to get your show back on the road — we’ve been proving that since 1947. Give Bar’s Leaks a shot and avoid that dreaded trip to the repair shop once and for all.

Part Number: 1040
Dosage: One bottle treats 4 to 6 quarts of oil. Larger systems use 1 bottle for every 5 quarts of oil capacity.
Size: 16.9 fl oz. (500 mL)

Testimonials & Reviews

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  • “This product saved me a lot of money. It made a good car into a really nice car. I'm really sold on the Bar's Leaks Real Main Seal repair, and I'll sure buy it again.”

    J. Elder - Altanta, GA
  • “I don't normally do this, but I've found an AMERICAN company whose products actually work, and work WELL!!! So I had to write to thank you for your hard work and integrity in a world filled with automotive charlatans and snake-oil marketing.

    Main seal leak stop saved my tractor. Oil leak stop saved my aging Subaru. Rislone keeps all my engines running clean and quiet, even with several hundred thousand miles! And Bar's Leaks has saved several radiators and heat exchangers. In a day and age where money does not go very far, your products help the average joe to keep a leg up, and repairs down, on a consistant basis!! I couldn't have kept three cars going through Northern Michigan's brutal seasons, while putting a kid through college without some help, and that came through in the form of several Bar's Products. Thank you folks, for your excellent products, and for keeping it simple, non-corporate, and integrity-based. Proud to be a fellow Michigander (Traverse City). Keep up the good work. You've got a devoted customer and free word-of-mouth advertising for life. -- Sincerely, Tim W.”

    Timothy W. - Traverse City, MI
  • “I just rebuilt my 1966 442 400 cu.in. engine. I was apparently rusty on how to properly install the rear main seal (rope style) and it leaked almost from the get-go. I reluctantly put a quart of your product in my engine. I put over 100 miles on it and it still leaked. I was going to pull the engine and do it right at the end of the summer. Two days later I noticed there was no oil under the car when I pulled out of the garage. I couldn't believe it, the leak stopped. No oil anywhere under the car. Un-believeable.”

    F. H. - Orland Park
  • “I have a 1985 Toyota Supra in mint condition; it has had an annoying small oil leak for over 10yrs now without finding a solution. I even tried engine oil stop leak from several companies without any luck. I saw your rear main seal conditioner and it was one that I never tried or heard of before so I tried it. WOW in less than 30 miles all the leaks stopped. Now with a total of 60 miles it still hasn'’t left any drops of oil on the garage floor. What a product. I will be adding it at every oil change from now on. Now my car is perfect once again. Thanks for coming up with such a GREAT product!”

    D. B. - Fair Lawn
  • “I am now a big fan of your Rear Main Seal Repair. I have a 69 Firebird 400 conv. that I have practically owned since new. It is mostly all original with original drivetrain, interior and top. It has 105K miles and when I have taken it out of the garage it has left a trail of oil down the driveway. After using your product I was amazed that the leak stopped. I have used other products but nothing helped. I would be glad to endorse your product and if you are interested I can send you pictures of the car. Thanks for a great product.”

    C. W. F. - Phoenix, AZ

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