I've done it often with no difficulty, but if you're putting 5-30 in a stovebolt engine, I'd question the wisdom of doing that. Stovebolts don't like water-thin oil.
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!