I used BlueDevil on someones car. Argued with them about it because I didn't want to use it. Not long after that we replaced 4 water pumps and eventually the leak from the head gasket cemented itself over the lifters. Looked like someone poured JB-Weld over 2 of the lifters.
Fix it rite the first time. I will never put any type of stop leak in any of my cars.
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