The secret to keeping your Mercedes diesel for a million miles is to find a good mechanic, change the filters and fluids when the mfr recommends and use OEM parts. I can't speak highly enough of these men. First, my car was serviced by Ken's brother. After he passed away, I started bringing my W-123 to Ken. He's never diagnosed a problem on my car incorrectly. He always uses OEM parts. The necessary repairs have always been completed on a timely basis The cost of the repairs have always been for the estimate or less than the estimate.