Consider changing your oil at even thousand, 3333 and 6666 odometer ending intervals so that it is easy to remember. You may have to reduce intervals to get caught up at first. As I believe MB's most stringent inteval for modern cars under severe duty was 3750 miles, this should be adequate, especially if using synthetic (which I am planning on trying at next change).

Sorry for the cheesy title.

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2008 GL320CDI 6K
1970 280SL 112K
1982 240D 210K (Sold)
1973 220D 220K (Sold)
1967 200D 160K (Sold)
1992 400E 139K (Sold)
1988 300E 148K (Sold)
1987 300D 257K (Sold)
1991 300E 108K (Sold)
1987 300E 131K (Sold)
1978 300D TMU (Sold)
1980 300D TMU (Sold)
MBCA Member