If you plan on following the FSS oil change intervals, be sure you use this type of filter,
http://catalog.eautopartscatalog.com/mercedesshop/sophio/quote.jsp?clientid=catalog.mercedesshop&cookieid=1W30TVH0Y1ZI0OB6CM&baseurl=http://catalog.peachparts.com/&partner=mercedesshop&year=2001&product=A6002-132846&application=000467357
If you don't know what FSS is I suggest you search this forum for tons of opinions on whether or not it is the best way to care for your engine. Follow the owner's manual recommendations for which oil to use. If you plan on caring for this car yourself, get the MB CD. Between it and this forum you should be good to go for all but the meanest repairs.
Good Luck, Dan