NAPA/Mac's brand engine oil stop leak part no. 9912 15 oz. bottle

[Electromotive]

Does anyone have any experience using this product to stop engine oil leaks (in particular rear main seal)? Bought it at NAPA today and will try it in 94 F150 300 Inline that has a minor rear main seal leak.

 

[Stonemason Jason]

Not exactly experience & not this product, but I once went to AutoZone to get some Bars stop leak, I had a 2006 Chevy uplander that was leaking oil, I ask the woman that was working if the stuff worked & she said she doesn't recommend in, I asked why not & she replied because if it seals the head gasket then it will seal things that don't need to be sealed in the engine such as passages that the engine needs to run efficiently, I ended up not buying the product.