I just picked up a Femco drain plug for my oil pan. It's a check valve drain that is activated when a special adapter is screwed on to drain the oil from the engine through the attached hose. It looks like a slick system and should be much cleaner than removing the plug. There is also a sample adapter that allows me to take a small oil sample from the pan which should be good to check for milkiness (running alcohol). I know Fram made one and I have seen a lot of bad feedback on that one. Has anyone had any experience with the Femco drain plugs?
http://www.nospillsystems.com/index.htm