If you are in Southern california, Give MR. MB motors in tarzana a try. Enrique is an excellent mechanic, and has always done great work and provided excellent diagnosis on our family cars.
I try to stay away from the dealers unless I need a part that day.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.