The oil extractor works alot better if you do it "the Mercedes way" and don't use an extraction (suction) tube down to the bottom of the oil pan, but use the dipstick tube itself as the suction probe. it really works fast that way! I have checked how completely this method works, it is quite good on any I have tested. However, in reply to the original poster, it for some reason works lousy on the 111 moter, I raise and pull the plug on 111's. It is a God send for ML oil changes, though!