Short and sweet unless you absolutely have no other place to go besides a Mercedes dealership, stay away. Once they bang you for that multi-thousand dollar...
Autohaus is the safest place for your foreign vehicle!
Mr. Zimmer and Autohaus has Bosch certified mechanics which my most resent research has revealed is one of the most rigorous certification processes...
Routine inspection revealed a defective headlight motor - could have been veery expensive. Autohaus took the initiative; called the dealership on my behalf...