We've owned my 300CD and wife's 300SD from new. They both get good mileage and we both drive what we want. After 27-years, she still loves her SD. After 25-years, I wouldn't trade Elvira for a newer diesel - mostly because MB hasn't built a better car since.

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Houston, Texas
1984 300CD 235K miles, Elvira, one owner
1987 300TD 180K miles
1974 TR6 78K miles Sarah Jane, one owner
OBK #27