It does work
My 2008 Chrysler Sebring convertible with over 160,900 miles had an engine oil seal leak. The car mechanic who regularly services my car said that fixing the leak would cost $1300 -$1500 and that based on the age and mileage of the car, it was not worth repairing. Several weeks before, it happened that I watched a video on YouTube by a person to whom I subscribe that tested various types of products one of which included engine oil sealants. He compared the different manufacturer products showing how he tested them and the results he got from these tests. Among the sealant products was ATP AT-205 Sealant. He showed that this product was the best in sealing the leak by rejuvenating the seals tested. Another person, a car mechanic of over 50 years, to whom I also subscribe said, based on his years of experience, that the ATP TP-205 product was the best even though it was somewhat expensive.
Based on the reviews of these two men whose advice I trust, I thought I would gamble on the ATP AT-205. If it worked I would save a bundle of money. If it didn't work, then I was out roughly $20. All I had to do to stop the leak was add 1 container of the product and drive. It claimed to stop the leak after 5 hours of driving. After 2 days of just under driving a total of 4 hours, there was still a sign of leaking but it did not look like oil but rather the APT AT-205 on the ground. After 1 more day and 2 more hours of driving, the ground under the engine was dry. After another 2 hours of driving today, the ground is still dry. So it appears the ATP AT-205 has kept its promise by doing its job. Hopefully, this will continue to work for another 100,000 miles of driving or till I get another car.
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