The only drawback to straight 30 is cold starting. The oil is about the consistency of honey at 30 degrees or below, so it's rough on starters, and the bearings run with limited lube for a while until the pressure gets to them. I like to run 20W-50, which flows like a 20W when cold, and lubricates like a 50 weight when hot. BTW the "W" indicates "winter" not "weight". "W" rated oils are flow-tested at 32 degrees F. There's no such thing as a 30W motor oil. Always use high-detergent HD30 if you choose to stick with a straight-weight oil, not the low-quality non-detergent oil that's intended mostly for worn-out oil burners. The old myth about detergent oil being bad for stovebolts still has a few true believers!
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!