While the leak is from the cover, the head gasket plays a big part. MB had service info on the subject years ago on the red microfilm that stated the diagnostic course was to reseal the cover and if that didn't fix it, then reseal the head. I can tell you that doesn't work for customers. Unless I know the car has the new updated gasket it gets a new head gasket the first time and only one trip.

For a little more info: http://www.continentalimports.com/ser_ic100345.html

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician