I've seen my dealer take out the oil with the vacuum also. What's the best method to getting the most used oil out? Draining or Vacuuming? And will elevating only the front end of the car while draining leave a lot of old oil? Or should I bring the car down level as it drains? Anal, yes. But it seems changing the oil is important but I would think removing as much of the old oil would be important in doing it right.