Get an 8 liter Mitivac fluid extractor that is air compressor driven, MV7300 series. Benz and other mfrs have been using these for years instead of fooling with drain plugs etc. and the see through body tells you exactly how much you pulled, so you know how much to replace. I use mine for tranny, brakes, oil, dif. Cars and M/C. Cost around 100 bucks. I don't know what a fumoto costs, but I'm pretty sure it doesn't do what my Mityvac does.