What is the recommended crush washer for the oil pan drain plug for a 308 engine?
Isn't it a pipe thread plug? No washer used.
A bit of teflon tape on those threads makes 1 less spot on the garage floor.
That's what I do with mine.
Teflon is fine for normal plumbing involving water, but not for petro-chemicals. It will eventually go soft.
The Yellow, thick variety is intended for LPG, oils, Gasoline. etc.. I had some that was made in Aussieland that specifically stated those applications on the label on the spool. I can't assure anyone that all yellow Teflon tape is so rated. You'll need to check for yourself, but it does exist.
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Teflon tape is fine with oils. It is heat that can cause problems with softening the polymer, or caustic will destroy it.
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