Competitor product didn't work, yours did

Just wanted to thank you. My museum quality 73 Chevy Luv 355 has had a rear main seal leak for a long time. Tried the competition and it slowed it down. Last oil change I tried your product. It worked fantastic! My baby is now completely oil leak free! I’m now a fan for life and will be spreading the word. Thanks again!

You saved me a ton of money, thank you!

I was very pleased using your Rear Main Seal Repair. I was looks at a $4000-5000 engine repair to my 1993 Cadillac Allante. To repair seals on my car the entire engine must be removed from the car! I had tried another brand of so called engine repair that did nothing as far as seal repairs. I ordered two (2) different Bar’s Leaks products before my last oil change and asked the mechanic to use instead of oil. I was very pleased after about a week that the leak was almost repaired, I ordered and added an additional bottle of Rear Main Seal Repair and as of today I have NO leaks. Thank you!

Definite improvement

I have a 2005 LaCrosse where I used Bar’s Leaks Heavy Duty Rear Main Seal Repair (1040). Definite improvement, reduced oil leak significantly.

Very impressed

Recently on my 80k original mile 2008 4.0 SOHC Ford Ranger I went to change the oil and couldn’t find the Motorcraft 5w30 synthetic blend oil that I have been using for the 4 years that I have owned it. My entire drivetrain has been dry & completely free of leaks. I ended up buying Mobil 1 full synthetic 5w30 oil. It has been in the engine for 2000 miles now and I noticed a leak which I am 100% certain was at the Rear Main Seal. I strongly suspect the Mobil 1 oil caused this leak in an otherwise completely dry, leak-free engine. Yesterday I drained the Mobil 1 and put my Motorcraft oil back in along with your HD (16.9oz) Rear Main Seal in, I then drove 100 miles as per the instructions on the bottle. I varied my speeds from 25 mph to 70 mph and when I got back home I slid a piece of cardboard under the engine there wasn’t a single drop of oil to leak onto it! I have used your products since 1973 with great success in cooling systems and am very impressed with the performance now of your Rear Main Seal worked. So thanks for that!

Fixed our problem, would use again

Rear Main Seal Repair is what we used. It did fix our problem and I will definitely consider the product again. Thank you! 

Cheaper than mechanic

Used Bar’s Rear Main Seal Repair for my 2000 Jeep Grand Cherokee, which was leaking for awhile. I used it once with a fresh oil change which slowed the leak down some. After 3000 miles I changed oil and added another bottle of Bar’s Leaks Rear Main Seal and drove it for another 1000 or so miles and the leak was gone. I’ve put on approximately 20000 miles since then without the leak reappearing. Was cheaper than replacing the rear main seal.

Stopped the leak for good

Heavy Duty Rear Main Seal Repair 1040 was the product I used.  

There was a small oil leak, and the product seemed to stop the leak for a while in my ‘08 Impala. Later I had valve cover gaskets replaced that stopped the leak for good. I’m not sure I had to do that, but I figured why not.

Did the trick for my Jeep with 250K miles!

I’ve used Bar’s Leaks products for over 40 years. My father owned an auto parts store, and we sold Bar’s Leaks. Back then people relied on the radiator sealer religiously. I recently used the Heavy Duty Rear Main Seal (#1040) on a slow drip on my 2006 Jeep and it did the trick. The Jeep has 250K miles and hope to get that much more out of it.

Worked like a charm, saved me huge money

My name is Steven and I had a 2000 Toyota Tundra with about 300,000 miles on it. The rear main seal was leaking, and I was quoted 500 for parts and labor. I ended up buying Bar’s Leaks Heavy Duty Rear Main Seal Repair. And let me tell you; it worked like a charm. No more leak nothing saved me huge money.

Worked great

I used the rear main seal repair part number 1040 in my 1953 Ford 801 PowerMaster tractor and it worked great. Thank you!

Leak stopped almost immediately

I had a rear main bearing seal leaking oil. I used the Bar’s Rear Main Seal repair (1040) and the leak stopped almost instantly, and it lasted for years. I will highly recommend this product and will use it again if the need arises.

Use it every oil change

I used the Rear Main Seal Stop Leak 1040 and it stopped my engine from leaking, great product. I add it to my crankcase every oil change and I haven’t had a leak for over 2 years. Again, great product and I highly recommend it.

It works

Hi, l used your Rear Main Seal Repair. After driving about 80 miles the problem was fixed. Works as advertised. Thank you very much!

Heavy duty rear main seal repair

It slowed the leak on a 2002 Nissan Xterra with 100k miles.

Rear main sealer

I spent $150 on a Titan product and my leak got worse, I bought 1 bottle of Bar’s Leaks and the leak stopped after 3 days, it’s the best product on the market, stay away from Titan products.

Rear Main Seal Repair WORKS!

I’ve never written a review on any product till now. My 20yr old Honda was dripping a couple of 4-4.5” puddles of oil overnight. The car is too old with 300,000 miles to give it an expensive overhaul. Getting tired of wiping up puddles every morning I decided to try a bottle of Bar’s Leaks Rear Main Seal Repair. Directions said it takes 2 days for product to work…today is 3rd day and I’m shocked to find one spot of maybe 2 drops of oil this morning!!! Shocked!! It works! Ps: Waiting to see what day 4 has for me? 😉

Bar leaks

This stuff stopped my oil leak as well as the smell of the leaking oil.

Rear main seal stop leak

One bottle and the main seal leak was stopped. Amazing stuff, saved me a load of cash.

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 Rear Main Seal repair, and I’ll sure buy it again.

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 consistent 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.

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.

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!

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.

I have a 1966 Bronco that had a steady rear main leak. I changed the oil pan gasket in hopes this was the problem. I was going to change the rear main seal but it was a one piece type. This means the transmission has to come out to replace the rear main. I was very discouraged after performing this very large job only to find out I had the same problem. A buddy of mine recommended your product and I was a little hesitant of a product like this. To my surprise it worked after driving the vehicle for two day I had no leaks. I was so relieved that I wanted to take the time and thank you for such a great product. This saved me so much time and aggravation as I am a do it yourselfer.

I am an amateur car collector and restorer (easy on the restoration). Recently I purchased a 1966 Ford Thunderbird, from the original owner. I drove it from Muncie IN. to New Mexico. After arriving home I started experiencing some problems with the car. Old cars have problems. The rear main seal was leaking. Before paying to have it replaced I used your Rear Main Seal restoration fluid. It worked perfectly! Then, I started getting water in the exhaust. Again, before paying for expensive repairs, I used your head gasket sealer. To my surprise it to worked perfectly! Your products have saved me hundreds of dollars in repairs. Just wanted to say thank you, and I will be recommending your products every chance I get.

I have a 1993 Allante Northstar, engine had a oil leak. Cadillac wanted $3,800.00 to fix it so I put a quart of Rear Main Seal Repair in the crank case I think it stop 99%. How long do you think this will last or should I try the same thing again, I also have a 1966 Impala with a leak around the rear main should I trust my luck, hoping to here from you, I have used your product since the 50’s keep up the good work an God bless all of you.

Hi my name is Paul I have a 1983 chaparal boat with a 120 hp io merc cruiser stern drive unit for power. Two weeks ago I noticed bad oil leak coming from the back of the motor. From where the leak was it looked like the oil pan was leaking, so my son and I went and put on a new oil pan gasket, the leak was still there. Not wanting to lose the whole boating season my father said I may want to try your Rear Main sealer. At this time I did not have $1800.00 dollars to repair it, so I tried your sealer. I ran the boat in my yard for about one half hour. I was disappointed as the leak was still there. I was losing a half a quart of oil in this short amount of time, after calling around again for repair prices I decided to try one more time. Being tired and mad I put the rpms from idle to 3000 and went into the house. after about forty minutes I went back out and I was shocked, I saw only a small amount in the drip pan. I could not believe what I saw! After checking the oil and measuring what was lost, I only lost a half of a cup of oil. I am very happy that repair in a bottle does work, Thank you for this product. I know that this is not a permanent fix but it looks like I will be able to use my boat for the rest of the summer season. I am hoping that my local parts store gets more in soon so I can have some on stand by. My son Ryan is a car repair tech and I told him to tell every one that this Rear Main sealer really works. Please do not stop making this product!

I don’t usually put additives in my vehicles, but I just recently purchased an old 1984 f250 with a 460 engine with a rear main seal leak. I heard these 460 engines always have trouble with the main seals leaking on them and I didn’t want to do a major repair on this vehicle because all I need this truck for is to help me and my wife move. So I heard about the Bars rear main seal additive working good for some people and so I decided what the heck and put it in this old truck. Well I was very surprised how well this stopped over 95% of my leak and it worked within 2 days. All I have is just a little bit of wetness on the trans. bell housing and it doesn’t drip at all like it used to. I am very pleased with this product. It saved me from having to do all that work. I would definitely buy this product again. Thank you Bars.

Had a Perkins 4-154 Diesel in a sailboat with heavy rear seal leaks, oil pressure below 20. Used for two oil changes, oil pressure went up to 35-40 and leaks down and eventually stopped. After 10 plus years she is still running without leaks or rebuild. Amazing.

I just wanted to thank you again for the product Concentrated Rear Main Seal Repair. Your product worked as advertised and will definitely do business with you again! I will also be sure to refer your company and this fine product to others. Thank you again for everything!!

Great for stern drive boats that sit for months. My 4.3 Chevy engine developed a rear main leak. Bar’s Leaks stopped the mess in the bilge.

I have a 1982 Corvette Stingray. For over 15 yrs main seal leaked a bit, I used this and it stopped leaking a few drives later. Love this product.