Doesn't MB spec. 6000 Mile oil changes? Change the filter and keep topping it off. My 300D doesn't burn ANY oil until ~3500 Miles, then it starts to burn, so watch out for unexpected oil consumption.

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1976 BMW 2002- 100k
1995 BMW 325i 175k
1984 Mercedes Benz 300D Turbo Diesel- 270,000 mi

1981 Mercedes Benz 240D- Estimated 300,000+ mi Returned to the earth