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

Okay, where do we begin. I bought my vehicle from a dealer who bought it from an insurance lot. Something has fallen onto the vehicle and crashed the hood and the surrounding areas. But the engine bay was untouched. The vehicle sat at the insurance lot for about 6 months without being started. Once the dealer purchased it he took it to a body shop where they fixed all the body panels the hood etc. Then when they try to sell the vehicle they had a hard time selling it because it was a six-speed manual transmission. So it's sad at the dealership for another 4 months. Now all this sitting and not running caused the rear main seal to dry out. After I purchased the vehicle about 3 months into driving a substantial leak happened at the rear main seal where I was losing about half a quart of oil a week. Took it to the dealership the estimate to fix it was around $3,800. Called a independent mechanic it was about 2800 to $3,000 to fix it. I just did not have that amount of money to throw at it. So I started searching online and stumbled upon AT205. Now before I purchased this product I did my due diligence did the research watched the video of the manufacturer. Educated myself and how is this product different from any other stop leak product. And where I was sold was that this product did not swell the seals but what it did was or what it does is it rejuvenates and restores the elasticity and the plasticity of the seals due to the plasticizers and plastic stabilizers that this product contains. So I bought it. The product arrived quickly, and as quickly as it did arrive I poured it into my engine. I mean what's the worst that can happen, it doesn't work right. I followed the instructions drove the car around for about 30 minutes to let everything mix in. And then it was time to drive and get about 5 hours of driving time. It took about 5 days of commuting back and forth to work to get those 5 hours in. After about 3 hours I noticed when I would stop at a parking spot for extended period of time and I would move my vehicle instead of having 10 drops of oil under the engine I would have three or four. After about 5 to 7 hours of driving The only oil left was the residual oil on the bottom of the engine that I have not wiped off yet because a car is too low to the ground. It's been about 2 weeks now and I have zero drips of oil under my car. Fresh oil that is. At my house in the driveway I still do have the oil spots from the leak that were there before I use this product. As of now there are dried out and everyday I check for new spots and I see any. I'm highly satisfied with this product and what it has done thus far. How is it going to work in the future I don't know. Will the oil leak come back with my next oil change not sure. But what I do know as of right now there's no leak. I'm thinking about buying another bottle and add it with my next oil change just to be sure that those seals get the love that they need to be able to seal the engine properly for a long time to come. One thing I'm going to do is, I will update this review a year from today. If you have a car that has a front main or rear main seal leak or any other leak when your engine try this product out it might just save you hundreds of dollars that you may or may not have. Yes I highly recommend this product to anybody that has a engine leak.

I’ve tried ATP AT-205 Reseal on three different cars, and the results were mixed but impressive in the right situations. On one car with a crankcase leak from a plug seal, it didn’t really help — no noticeable improvement there. On another car with a manual transmission gearbox that had visible leaks, I added a bottle and within two weeks the leak stopped completely. Four years later, it’s still holding up with no leaks at all, which is pretty amazing. I also used it as preventive maintenance on a 4AT transmission at around 120k miles. It’s been three years since, and everything is still fine, no issues. Weather in my part of the work is considered summer ALL YEAR ROUND. Conclusion: ATP AT-205 Reseal can be a great product, but it really depends on the condition of the seals. If the seals are totally hardened or torn, it won’t work. But for moderate leaks or preventive use, it can deliver excellent long-term results.

I have a 2002 Escalade EXT 6.0 AWD. When I got this truck, it had a serious rear main seal leak. Oil change dude told me it was a number 5 outta 5 the amount. I bought AT-205 and added the whole bottle into 6pt of oil for the last 1000 miles of an oil change cycle. It immediately stopped the leak. I changed the oil and have been checking it diligently. Still, no leak. The oil pressure and the color of the new oil is great. I did notice a slight drop in oil pressure when I added it, but is fine now. VERY IMPRESSED!!!!

2009 Impala 3.5L V6 developed a power steering leak from the passenger side rack and pinion seal in September 2025. This was manageable until November when the leak started to get so bad that I could go on a 30-mile round trip, and after getting back my power steering reservoir would be almost empty. I could feel the power steering going hard as I was driving, and it was leaking fluid all over the subframe and onto the ground. With the car on jack stands and running, you could literally see fluid dripping onto the ground. I had also heard of this product from Scotty Kilmer and a few other people. I put only about 1.5 oz of this stuff in. I've driven almost 1200 miles since then, and this stuff really does work very well. Many days I'll come home and there will be effectively zero fluid loss. It usually takes me about 3 weeks for the reservoir level to be close enough to the "low" line that I don't want to risk running the pump dry, and so I'll add fluid then. Mind you - this Impala has a pretty small reservoir capacity, so we're talking a few ounces of fluid at most. I have no doubt that this product could also fix a small oil leak from the valve cover and oil pan gaskets on this car. Project Farm, scientific car channel, tested oil "stop leak" products, and AT-205 was THE best in restoring worn rubber seals to their original thickness. Also keep in mind that power steering systems are probably the least likely to benefit from this product, and it's worked very well for me. This product is not going to help you if you have an obvious tear in the seal. It can't mend two broken bits of rubber back together. But if your seals are just old and shrunken like mine are on a 17-year-old GM product with 150,000 miles in Ohio weather, this stuff is well worth the money to at least try it and see if it works - and if it doesn't, then you know you have a bigger problem on your hands.

I have a fairly mint 2006 BMW 530. I've spent the last year or so trying to restore it to top performance and fuel economy by refreshing the fuel system and sealing any and every last gap. I replaced all the related consumable parts like the oil fill cap (the gasket was super flat), the gas cap, manifold gaskets, fuel filter, O2 sensors, plugs etc. The changes were noticeable at every step. But when I was sure I was finally done, I checked the long term fuel trims and did a smoke test. And wouldn't you know the LTFTs were at like 15% and smoke was coming out of the valve head cover on all sides. I replaced the valve cover gasket maybe 3 years ago figured it was good, but just dry-shrunk. So this seemed like the perfect time to try AT-205 having heard rave reviews about it. I added about 1 oz for every quart of fuel and immediately ran out for a few errands to give it a chance to mix well. It was that easy. And wouldn't you know its just 3 days later and the LTFTs are now steady between 0-2% and I'm not seeing any smoke even when I crank my machine up to 25psi. You can (not) hear and feel it in the idle of the car too. You have to be standing right next to it to even hear that its running or check the dash if your in the car. ATP was the magic sauce that got me to a perfectly sealed, optimally efficient drive. I CAN believe that such a simple product can deliver such measurable results so easily, because literally everybody who knows says so. But its still amazing to realize the results for yourself. If you even think you have dry rubber or leaky gaskets, it seems like it will pay for itself in fuel economy alone in short order. Don't even hesitate. This stuff is liquid gold.

Stopped the leak in the front axle seal of my 97 Wrangler and the oil cooler seal in my Nissan Titan. Great stuff!

I had a bad rear main seal leak and I tried a few different sealers. The blue devil rear main seal worked well for a bit but didn’t hold up. Tried this along with adding a thicker oil and my leak was reduced significantly on my 2007 GMC Yukon! I would lose a quart or two of oil in about 700 miles. Now I lose the same but at about 2,500 miles. Definitely worth a try!

Works fairly well, but the price has more than doubled. I looked back a year or so ago the last time I bought this for $9.99. Forward to now. $23.00 and change. What’s up with this ? I understand a few dollars with inflation and general price craziness in the world, but this seem greedy.

It is useful and powerful product which solve 100% your car issue. I strongly recommend it. Must buy worth product.

Alles ok

Normally I do not believe in products like this, in the past I was using one with Liquid and M... in name, but it did not work. I didn't want to disassemble steering rack in my old car, so I figured I could continue with the leak or roll a dice on this 40 eur thing. It just works :D The description says "will work in 5 hours" - yeah right. It turned out it did. I put it in, drove the car for around an hour and parked overnight. No leak! Previously it would leave an wet undercariage of a car, but now after 2 weeks driving - dry. I 100% recommend, if I will need something like this in a future I will definatelly use this one.

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