ATP Automotive AT-205 Re-Seal Stops Leaks, 8 Ounce Bottle,1-Pack

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.

Our 2006 Itasca/Winnebago Class A has four massive hydraulic jacks for leveling and stabilization that were leaking at the seals when we bought it in spring of 2025. Previous owner said the problem was especially bad when the RV was stored with jacks down over winter. The problem got really ugly when I discovered that the jacks were no longer available and would need to be replaced entirely, unless I wanted to attempt an undocumented seal replacement science experiment. Replacing the entire set would have cost $8,000 and (wait for it) ther'd be NO WARRANTY unless I replaced the pump and control valve body at the same time! I tend to be skeptical of 'repair juice' -- but just one bottle of this in the 2 gallon main reservoir (and about twenty cycles later) the leaks had stopped completely -- the rams were totally dry! The acid test came when we put it away in November, left it on the jacks and now six months later there has been absolutely ZERO leakage despite winter temperatures down to minus 26 degrees! The pump runs smoother and the system works like new. I will use this stuff in ANY hydraulic system at the first sign of wetness at the seals.

Worked Great!!! I used this in my 2003 Ford Ranger 4.0L. Old Engine broke a timing chain and ruined the engine (162,000 Miles) . Upon Mechanics advise I replaced the engine with a used engine of 88,000 miles. "No telling how long the engine spent setting, and I am positive now that all of the gaskets were dried out ". After install, I noticed a slow leak showing up. When I asked my mechanic about adding any Engine stop leak he immediately "No". Drive as much as possible and let the oils heat up and saturate any gaskets and see if it stops. No Burning Smoke, Not loosing any coolant, so I went online searching for info and came across this ATP. I Trouble shot a lot of options and figured it might be the Rear Main Seal, but just not sure. Researched options and came across This Stuff!. Not like some of the other additives that can clog other part and cause more problems, I figured for around $10 why not try. Glad I Did! As the Directions State to add the correct amount to your oil (Mine came out to 6.6 oz from the 8oz bottle for a 5qt oil). Drove to town and around letting the Engine get to, and run at normal heat for at least 45 min. before making my first stop. A few more start & stops and then the trip home. Parked the truck on the concrete pad with oil dry covering any old leak spots. Parked the truck over night and WALLAH!! the next morning.. No new leak spot! This stuff is thin and not thick like other brands sold at Auto Parts Stores, So I am confident it rejuvenated and swelled any rubber type seals in my engine without clogging or plugging like other brands. I plan on even changing the oil to confirm it has completely worked. I am very confident it has. I HIGHLY RECOMMEND this ATP Product for any suspicious slow leaks that may come from any Rubber Gaskets. Do your research, but this was the best $10 I ever spent and Shipping was faster that originally stated. Original tracking stated 4-10 Business days. I received mine in 3 days. I will defiantly buy again to have on hand for any future needs. Has a lot of use potential. I hope any future users have the same results if Gaskets are not totally blown out! As stated on the product description. Good Luck! It's worth the $10 vs costly tear down and gasket replacement. ATP AT-205 Re-Seal Stops Leaks, 8 Ounce Bottle PS..This is not currently found in any Auto Parts Stores. THANK YOU AMAZON!! I showed the bottle to one of my ASE Mechanic buddy's who is a store manager @ an O'riley's and he had never seen or heard of this stuff. Blue Devil, yes.., but not this. Thanks Jerry31368

First off the label says it it non-toxic, which is kinda strange considering that it also says not to allow it to contact skin, eyes, painted surfaces and brake systems. I guess what they mean is that it can cause serious injury but wont kill you. Anyway the good stuff: Claims to work on: Engine leaks Transmission leaks Power steering leaks Rack and pinion leaks & any other fluid system Exception: do not use in brake systems. Pros: Does not appear to mush out (over-soften) rubber seals/rings when used full strength (undiluted). Seals seem to retain their elasticity and tensile strength (great). Not much odor, clear and easy to handle. Cheap for what it claims it does. Cons: Tiny bottle 8 oz. Observations: So far, I have not yet seen where the rubber seals/rings increase in size (expand) when soaked overnight at full strength (this was a bit odd). Cheap enough to be used for testing purposes. Based on limited testing I can only say that it seems that it would only seal very tiny leaks, since the rubber seals dont appear to swell (within human perception). I will update when further info becomes available (shortly). I am currently testing on a few items: transmission dipstick seal, civic top cover bolt seals, AC coupler o-ring, distributor seal, suspension bushing (front and back), radiator cap seal (watching this one closely). I will also change the rating - i hope it will do well. Update on Nov 10, 2012 Transmission dipstick seal - works great, its now firmly in place - was very loose before using. Engine Oil dipstick seal - works great, its now super firm in place Note: Both dipstick seals took a whole week to swell and notice the difference. Civic top cover bolt seals - just applied some today, have to wait on results. AC coupler o-ring - no visible signs yet. Will have to use on live AC system to test. Windshield wiper rubber - Not recommended, rubber becomes too sticky and uneven - does not clean debris well after use. Update to Jan 26, 2013: Used it to stop a small power steering. It did make some difference to slow the leak even more. It did not stop the top cover bolt leak, nor the small transmission & engine leak (Only used a little in all three). Radiator cap seems marginally more prone to leaking after the fact. So I guess this product works best under certain "ideal" conditions. I would still buy it for specialist applications due to its cheap cost.

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.

Follow the directions on the bottle religiously!! This stuff works unless the seals are completely shot or destroyed. You can definitely extend the life of your old seals by using this sealer. I extended the rear main seal for almost 2 years by following the directions. Just make sure you drive the vehicle for about 1/2 hour or longer if you can when you put it in the engine or transmission. The heat allows the sealer to penetrate the old seals and condition or cause them to soften and swell back closer to their original diameter, This usually stops the leak in it's tracks until the next fluid change. I can never find this locally, so I usually buy a couple at a time. One for now one for the next change!

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.

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!!!!

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.

Tutto perfetto

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