[Jeff Higgins]

Maybe I'm old fashioned, but this sounds at least a bit sketchy to me. I always figured that no matter how fast I get to the drain plug after driving around and warming up the motor, whatever particulates are suspended in the oil will already have begun to settle. The vortex created when it drains out a hole in the bottom at least partially stirs things up and re-suspends those particulates, so they can drain. At least that's the mental image I've conjured up for myself. Could be completely wrong, of course. Maybe the sucking up through a tube does the same thing.