240Ds are slower than the rest of traffic, but as long as the speeds aren't over 80mph, the 240D will keep up just fine.

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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