After becoming disillusioned with Walnut Creek Mercedes Service, I switched my MB service to M Service. The MB dealership service has gone downhill ever since Sonic took over Stead and the service managers are no better than used car salespeople. This is NOT the case at M Service - the rates are very competitive and the service is bar far superior to what you'd find a Mercedes Benz of Walnut Creek. I highly recommend M Service for those looking for a quality service at great prices.