Oil extractor

I use one on my 3.0 MB diesel and it works very good. The jeep as too much******to remove I order to get at the plug plus the oil filter is top mounted. It removes 100% of the oil. I have the Mytivac but it doesn't work on my 6.2 GM v8 in my Denali. I put the drain valves on my Yukon and Cummins.
The MB dealers suck out most of their cars through the dip stick.