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Its a German car and they are known for electrical problems. Your problem lies within the Drivers light assembly, check the voltage voming into the headlight socket with multimeter and see if there are any voltage spikes or drops, alternating.
I believe you have a head gasket or cylinder head problem (cracked head or blown head gasket).. If it is the gasket, the intake and cylinder head must be removed and a new gasket installed.. If it is the head itself, in addition to what have just said, you will have to have the head repaired or get a reconditoned or new one. This is a major repair.
You either have a bad ground or the bad electrical connection at the light socket is "simulating" a bad ground. This is putting a high resistance on the bulb and it's taking it's toll by burning out the bulb.
I would start with a new socket, and CHECK the ground. If you still have the issue, I would run another complete ground wire and not even worry about checking the ground itself.
Depends on your level of experience, quality of your tools and whether or not you have any frozen head bolts. The valve assembly and head come off as one unit on those. To clear the wires, emmision controls ect off of the top of the valve cover 30 minutes. remove valve cover 5 minutes (too scrape off excess gasket material. to remove exhaust manifold from side of head, (assuming no broken/stuck/stripped bolts 15 minutes with good hydraulic tools. To remove head (assuming all goes well and hydraulic tools, 15 minutes. To reassemble, double all times as surfaces need to be prepped and gaskets applied and proper torque on all bolts. It's an afternoon job if you ahve everything you need and nothing goes wrong. Typically add at least two or three hours of drilling and cursing to a head gasket replacement. and a trip for new drill bits and a tap (not beer) for the new hole you drilled.