I have been working on gasoline engines since my dad showed me how to adjust a 2 stroke lawnmower engine in the early 70s Fast forward - I was doing an oil change on my car and the oil pan plug crush washer was toast and I forgot to refill my toolbox stock so I had no new crush washer - I was in a time pinch and noticed a roll of gas and oil pipe thread seal tape I had leftover from a gas pipe project to my gas grill - I looked up the specs - good for natural gas - and oil to 500 degrees - I put three wraps on the drain plug and proceeded as normal - I’ve added that to every oil change over the last 30 years and never worried about crush washers since. Just last year my daughter now in her 30s says she had her oil changed at the dealer - they gave her a hard time about the thread tape - I told her don’t worry about it - but now I wonder if I have been doing it all wrong the past 30 some years ?? Has anyone else used the yellow Teflon tape this way ? Its made by Oatley - I buy it in the plumbing dept at Lowe’s