this is what i use, but i still pull the plug. there's always a bit, never alot. more like good puddle.

Jabsco Flat Tank Oil Changer System, Model# 17860-1012 | Oil Extractors| Northern Tool + Equipment

fwiw, mb designed the oilpans in 74 and later cars for siphons. most mb dealer do it this way. good luck, chuck.