Expect to pay $4.50 or more, all about the same. You can leave it in there for 6000 miles, at least, without worry, so it isn't all that much more expensive if you normally change at 3000 miles.

Use a good (Bosch or Beru, other German) filter, not a Fram or some such.

MBs take a LOT of oil by american standards -- my 280 SE 4.5 (and all other 116/117) engines takes 9 quarts with filter change, the TE takes six, and the 300D takes 8.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!