Other minor repairs I do myself.
Ever watch someone from Jiffy? They drain the oil, and within seconds screw the drain plug back in, leaving almost another 1/4 of a quart of dirty oil still in the engine, that would have otherwise slowly drained out if they'd left the drain plug out, and allowed it to drain.
If you like your engine, leave the drain plug off for at least 20 minutes and let it drain out.