Where does it drip on the exhaust? On the side or behind the engine?
Is there oil on the black plastic ignition rail that covers all the plugs?
Is there oil where the black intake pipes meet the intake mainfold?
It is not very likely a head gasket since this engine uses very good
sealant for the head to block contact area.
Is the ABC fluid reservoir low? this is also very common to leak onto
exhaust. See dealer for recall/service campaign.
DR.D

__________________
Dr.Diesel -
Shop Foreman
Master Guild Mercedes-Benz Technician.

Think the dealer is expensive? Do you know how much it costs to train a dealer tech? Or buy the required MB special tools to have on hand?