Be very cautious with a purchase like this. Even though the car is only 6 years old, this is serious mileage. If it was owned/maintained by a very anal previous owner who made sure that everything was maintained properly and fixed every little anamoly that popped up then you may be able to pat yourself on the back 4 years from now on what a great car this has been. If not, be prepared to do all the things the previous owner(s) failed to do. If you can't confirm (through inspection or records) that a wear-and-tear item has been recently replaced/repaired, be prepared to foot the bill! (Flex disks, AMM, compressor, lower control arm bushings, etc, etc.!) Some of the most expensive used MBs are the ones that cost the least. Do your homework and make sure someone that knows these cars inspects it.
Good Luck, Dan

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2012 E350 Bluetech