I am also on the Turbodieselregister.com and guys and now my self are buying 2 stroke oil at Walmart and adding it. I am adding 16oz to a tank of 34 gallons on my new Dodge. It comes out to $1.00 a tank as the gallon jug of oil is $8.00.
Yes the pumps on the mercedes are pressure lubricated but the injectors are not nor the small valves on top of the injector pump before the injector lines.

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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.