It's amazing most dealers do ANY business whatsoever. They just look at people as a hassle and prey on the dumb ones to make money. The service departments are not much better. You are lucky you are in the DC area, there are lots of Benz service places around (both corporate and independent). I know of few independents around me (Annapolis), and plan on talking to them before I take mine to the local Chrysler dealer. I've only got 4,000 miles on Otto so far, so no need for service yet.