 I got this Mercedes SUV diesel Bluetec 2012 new from dealership. from day one I had problem. I bought this around 55 K and it blue book value after 5 years is around 22K. car was treated right but had issue with condensation of front shield make it dangerous to drive in cold weather, dealer didn't do anything about it. . recently the sign for coolant was appeared  , add antifreeze . My wife  along with my daughter was driving it and all of the sudden engine stalled, had to call 911 to get protection because of location of the car on the side of the road. car was towed to dealership and the say the engine was seized and need new engine with price tag of 27 K and 2 K labor .Interesting enough no explanation why did it happen. some research showed these cars have issue with oil cooler and leakage can happen . the problem is sign of coolant doesn't tell you what kind of coolant. car this expensive should warn you better. I never buy Mercedes again.