Eric,

When you drain the oil out and change the filter you get a about another quart out than is normally "stored" in the pan. So, you should start the car, run it until you see you have oil pressure, check for leaks, then shut it down. Wait a few minutes and check it again.

The capacity is listed in the owner's manual as 6.5 liters, with the filter change. That is closer to 7 quarts than 6, so fire it up and check it after you get the full 3 bar oil pressure for a few minutes. Good luck, Jim

__________________
Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)