I have got ATF leaking into engine on my park avenue 1991 3.8v6. transmission fluid level goes down and engine oil goes up and become red. How it possible? No one opening bonnet except myself.

1991 Buick Park Avenue - Trans fluid in the engine oil

Scrapyard-John May 26, 2019, 11:50pm 12

I did use seafoam in the oil in that engine once. It worked too.

I always sort of wondered if Marvel Mystery oil wasn’t repackaged atf. Have never used it.

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