Has anyone tried to change their oil using the Mityvac ? I have one that I use on my Mercedes, the 7201 series I believe ( they recommend doing it this way through the dipstick ) and tried it on my 2002 VSRCA and it seemed to pull most of the oil out of the engine without me having to remove the drain plug. I have the one that reverses so I can pump the used oil back in the new oil container. If you have not tried and have one it worked really well for me .