I used to go here until I took my 300D in because it would not shut off. I was charged $200 and something dollars for the repair. It would shut off but ran poorly. After inspecting it myself, discovered that the vacuum line to the turbo had been plugged as there was a leak in the a rubber connector. I replaced the connector (50 cents) and the car worked fine. I still own a Mercedes but will never go there again. I do the work myself.