ATP Automotive AT-205 Re-Seal Stops Leaks, 8 Ounce Bottle

I have to say that it is very rare I would ever use or recommend anything from the "snake oil" section of an auto parts storeThis AT-205 I had researched and felt as comfortable as one can be using any additive.I had purchased a 2006 Ford Explorer with a very minor leak at the rear main seal. I am sure starting with a very minor leak helped to.The vehicle literally looked brand new. It looked like the leather seats had never been used. There was not a single mark on the paint. The motor and transmission worked flawlessly. The only thing I intended to do is replace the plugs with high end Iridiums, the old ones were worn but nothing about their condition otherwise.Its a big job to replace the rear main seal so I decided to give this a try along with a high end oil and filter change then another after a short time to help remove some of the sludge.I added a bottle of this with the second oil change and obviously the seal swelled as intended and there was no more leak.I had a motor that had been well maintained and a very minor leak. Had the leak been worse I suspect this would not have worked as well, fix things fast before they get worse and more expensive.But I was fortunate and this additive was a legitimate product and did what it was designed to do.There is no question this worked in my case and saved me big money if I had needed to replace that sealIf your leak is minor then I have to recommend giving this a try. It is one of the rare items that actually worked as intended.I am very happy with the results.I have watched how spraying this on rubber suspension parts extends their life as they do dry out. Not a bad idea and perhaps save some big amounts of cash.

I bought a used Tundra with 140K miles on it that I knew had a leaking rear main seal. It was a $1000 repair if you get a really great deal. I ended up getting the truck for a really good price and was prepared to get the rear main seal fixed. I ended up putting it off and it was going through a bout a quart of oil in 5000 miles. I wasn't worried. Some German cars tell you going through a quart every 800 miles is normal. WTF?My old truck had the transmission go out on the road and I had to get it rebuilt by AAmco. They convinced me to replace the rear main seal while the transmission was out even though it wasn't leaking. I continued my trip, had the transmission checked out as required. I was informed then that the new rear main seal was leaking. On my way home I stopped at the Aamco transmission shop to get it fixed under warranty. Unfortunately it was Saturday. They told me I would have to stick around for 2-3 days but they would fix it for free. They also told me that I could just get it fixed at an AAmco near home. This turned out to not be true. The Aamco near home wanted another $1200 to replace it. I wasn't going to pay another $1200 after just paying $3500 to for the trans rebuild. I ended up putting some stop leak product in the Transmission. It slowed it down but never completely stopped it.After getting a few estimates to get the rear Main seal replaced I decided to look into Transmission Stop Leak again. I found this product and it seemed better than what I had used previously and that worked OK. I put it in according to instructions and drove around with it until my next oil change was due. I took it to a local Toyota dealership which had very reasonable oil change prices, only about 5 dollars more than it would cost me to buy the oil and filter. Tundras take 8 qts of Full synthetic. They confirmed that I needed a rear main seal. I asked them what about putting Stop Leak in the Transmission. They told not to do that because there was a good chance it would ruin the transmission. Well too late I had already used it. I decided to wait and see what would happen because it had only used 1 quart between oil changes. Oil is a lot cheaper than replacing the rear main seal. I am so glad I did because as per their instructions before I went back for the next oil change I cleaned the motor off really well with degreaser and a pressure washer. This time they told me that it wasn't the rear main seal that was leaking but the Cam Towers. This was goin go be $4200 to fix. Since it was using less oil I decided to wait a little longer to see what happened. The bottom line is AT-205 RE-Seal didn't ruin my motor. It did stop the oil leaks though. Toyota told me I had very slight weepage around my valve cover gaskets but never either of the other 2 oil leaks again. I can only assume they thought I got them fixed. I cleaned up the under carriage a few more times to check on things and was amazed at how well this product worked to soften up those seals to stop the oil leaks. I now have more than 180k miles on the Tundra and the only time it uses oil is towing a trailer at 70-80 mph for long trips. This product is a bit more expensive than some of the brands but in my opinion well worth it.

This product works! However it only works on seals that are leaking because the rubber has hardened. AT-205 is a plasticizer, it restores flexibility to rubber, this is not like other products that cause rubber to swell. If you have a leaking oil seal give this a try.

Stopped and slowed a couple of weeping seals that were leaking motor oil on a V8 with 210,000 miles. It takes a couple of week before you notice the leaks have stopped but it definitely is worth a try before spending $3000 for a partial teardown of your engine.DO NOT use in your transmission, transfer case, power steering, or any other system. USE ONLY for MOTOR OIL in your engine.

I can’t say enough good things about stop leak. My high-mileage car had a persistent oil leak coming from the engine, and I was looking at a pricey repair job. After some research, I decided to give this product a try as a temporary fix—and it worked better than I expected.I followed the instructions and poured it directly into the engine oil. Within just a couple of days, the leak slowed down dramatically, and by the end of the week, it had virtually stopped. I’ve now driven over 1,000 miles without a single drop on the driveway!What impressed me most is that it didn’t just mask the problem—it actually reconditioned the seals and helped reduce engine noise too. It’s a great solution if you're dealing with an aging engine and want to avoid an immediate, expensive trip to the mechanic.For the price and ease of use,it is absolutely worth it. Just make sure to use it exactly as directed and give it a little time to work. Highly recommended for minor to moderate engine oil leaks!