I pulled full maintenance on the transmission today. I went back with full synthetic transmission fluid. I just can't describe the difference the synthetic fluid makes in one of these cars. It is smooth as silk shifting, and going from reverse to drive is a whole new feeling. Mercedes dealerships don't pull the maintenace on certain areas like required I have been told. I am a firm believer in preventative maintenance. I know what can happen to one of these transmissions if a piston etc. is sticking etc. I feel it's a 100K transmission again with prescribed maintenace along the way. Again thanks for the help!!