Oil Capacity 8 quarts.
I performed an oil change on my 2002 C320, from underneath without a topsider, then refilled the crankcase with 8 US quarts of Mobil 1. When i ran the motor until it was warmed up, parked on level ground, and checked the oil level from the dash, it stated to perform the FSS Service A interval ontime, which lead me to believe, that I fooled the computer that the car was burning oil??? (I.E. it was 1/2 quart low as the capacity is 8.5 quarts) Anybody have similar issues. I can only guess that this is why the car is telling me to "perform service ontime" from the check oil level thingy.
FYI, if you don't use a Topsider, and you utilize the drain plug, there are two covers that need to be removed from the underside of the car, do a search on "Do I need a Topsider" and there is a good tip from one of the MB techs on this procedure.