Good luck on solving your problem, but if the attitude case persists, you're probably on your own. There are several hundred years' worth of experience represented by the membership here, including some of us who have made our living keeping cars and trucks running for the past half-century or more.
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!