One thing we don't need to be concerned about on our old rigs is the fact that the acetic acid (vinegar smell) that's present in most RTV products can "poison" O2 sensors on modern vehicles equipped with them if the vapors get into the exhaust stream. There are RTV products labeled "O2 sensor safe" that don't contain acetic acid as a curing agent. Just a "heads-up" for folks who also work on the newfangled vehicles!
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!