Works as described. I had no problem sucking oil out of my bro's BMW E46. The entire process was a bit slow but I think the oil wasn't as hot as it should've been. The important thing here though is that the unit worked well.  It was my first time using so I'm not sure how fast or slow it was going to take. I had to stop a couple of times to make sure oil was still being sucked out. When you pull the tube out and you hear a draining sound that means air is releasing and oil isn't being sucked in anymore and you see the whole tube drain oil. So I know it was working since every time I put it back and did it again, the oil started to be sucked out.