I put engine flush in an 81 T-bird w/ 302. The engine ran maybe 2 weeks after I did that. Threw a piston. My buddy's father flushed a tranny in his Stang and it never shifted right after that. I'm not sure if this is what you're talking about doing but I will NEVER flush anything mechanical. Only toilets from now on laugh

"If you're pushing crazy I'm all full up here."

{Black '96 Contour SE MTX w/ over 126k on the clock}
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