Has been great, have 70,854 miles, next oil change due at 89,000,miles,

Service C is a normal Mercedes service based on age, condition of vehicle and time/mileage since last service. The list of items to be serviced is determined by the on board computer and "C" determines the length of time for the service. "C" is about 3.5 hours and so your dealer will charge you 3.5 hours labour plus parts. Services range from "A" thru to "H", H being longest and A shortest.