There was a recent article written up on this device, basically to test to see if it actually works and is it better then the conventional method. They said yes it works, but is not as good as the old fashioned way of removing the drain plug. In their test they said the topsider did leave some residue/old oil in the bottom, typically found to be the bad stuff that gravity pulls to the bottom of the drain pan. So keep on loving it but I will keep draining from the pan like I have been with all my cars for what seems like forever.