If you pour clean oil into a non running engine with the drain plug out, you might clean some of the gunk along the path the clean oil takes. But the oil won't get to very many places if the oil pump isn't running. You also won't get the full effect of oil holding gunk in suspension if it isn't at operating temperature. You're probably better off using ATF since it'll do a better job of cleaning whatever it touches in the engine even at room temperature.
How about we go back to the W198 300SL with no oil filter and 1,000 mile oil change recommendation?