I have a 1997 E320 (I6) about due for her 90,000 kilometre (NOT MILES) service. Can anyone out there give me an idea as to what happens at this service? It recently had a head gasket replacement. It has been running beautifully thus far. The previous owner had the car serviced regularly by MB. MB here were very vague, "we'll just plug her into the computer and see what comes up mate..." was my answer when I queried.