Kaydee, in the USA the A and B Services are at 15,000 mile intervals for that vintage MB. If you're dealing in kilometers I'd expect the intervals to be 25,000 km. Most folks prefer to change oil every 7,500 miles or less even though the newer MB cars rely on the FSS ... computer informing the driver when service is due.

I agree with Ethan ... contact your local MB dealer and acquire a Service Booklet and Owner's Manual for applicable to your C240.

__________________
Fred Hoelzle