One problem related to engine grinding noise has been reported for the 2006 Mercedes Benz E350. The most recently reported issues are listed below.
The contact owns a 2006 Mercedes Benz E350. The contact stated that the vehicle exhibited an abnormal grinding noise and was taken to an independent mechanic. The mechanic test drove the vehicle and was unable to duplicate the failure. The vehicle was taken to a second dealer where they performed a diagnostic test that concluded that the engine vacuum pump was leaking oil and needed to be replaced. The manufacturer was not made aware of the failure. No repairs were performed. The current mileage was approximately 32,000 and the failure mileage was approximately 31,000.