"Wrong! Used oil contains a nasty mixmash of acids formed while the engine is running"
The oil never has time to go bad, think about it, the motor only running maybe 100hrs max, and that's if I'm using it lots, a season. the oil never even gets discolored in a season, so to worry about the oil to me is nonsense. Your buddies telling you to change the oil in fall and then again in spring are just making you waste money and oil. As for turning the motor over when dry, your motor always turns the first so many turns dry anyways, it has to suck up the water which takes some turns. I agree with draining the carbs though.