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Blew head gasket by incorrect use of STP (archive)

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Posted by GH on April 10, 1999 at 10:46:11:

In Reply to: OH NO! There's oil in the coolant. posted by MJKHAN on April 09, 1999 at 15:11:52:

I blew a head gasket at 40K by incorrectly using STP Fuel System Cleaner. I was on a trip and "thought" it would be a good time the really clean the injectors, valves and pistons. I ran three treatments back to back instead only every 4K miles per instructions. The product works from personal experience but now I "do" follow the directions on the bottle.

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