I bought one and used it on my Ford Escape then on the Mustang GT for oil. I pulled the plug afterwards to see how good the drain was. The Escape was parked on flat driveway and I got a pretty good drain, perhaps better than pulling the plug only. On the Mustang, I drove it up on my Rhino ramps. The pump was not as effective on it. The Mustang seems to get an excellent drain when the ramps are used. Overall, I would say that it works pretty well. It is kind of slow. It will depend on your vehicle. I think you have to pull the plug afterwards to see how well it works. I think I will use it on the Escape next time without pulling the plug. I have not used it for ATF but I think it might work well.