Woodsy Owl says "WHOOOOOO- - - - - -CARES?" 30 weight oil is too thick for anything but extremely hot climates. You'll beat the rod bearings to death on a cold startup before they get enough oil pressure to lubricate them properly in all but the hottest summer weather. On an old engine with three times the recommended rod bearing clearance due to worn bearings, it might prolong the engine life a while before it beats itself into oblivion.
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!