Hmmm wouldn't it depend if the dealer "drained" it or "sucked" it. I've seen other information about Mercedes dealership not ever removing a drain plug because they insert that suction tube and pull out the old oil. Now I'm sure that if the (well trained?) Crossfire technician didn't insert the tube all the way to the bottom then not all of the old oil would be removed.

The more times I read about screw-ups with a simple friggin' oil change the more I'm likely to do it myself when the time comes. How the frig can these dealerships screw-up such a simple process.
ARG!