If you live in Boston, take your car to Carmine at European Car Doctors. He's in Kenmore behined the Boston Beer Works (connected to the big Fenway parking lot). $80 per hour labor rate and he as honest as they come. He's actually refused to do work that I've requested and then told me why it would be wasting my money. Mainly Mercedes but he'll work on anything German. 617 262-5525.