I taught auto mechanics for 30-something years, after being a line mechanic and shop owner off and on since the early 1960's. I grew up around the best independent auto shop in Nashville Tennessee in the 1950's.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!