yo fellas,there is a device that you put down your dipsick tube and it will sifen the oil out of the engine.ive used one at one of the mechanical shops i worked at.i dont like em.if you dont put tube all the way in to the bottom of the sump,then it wont such out all the oil from the bottom.i didnt think there was any real bennefit to it,so i used to do oil changes the conventional way.
hope this helps.