FWIW. Skip down to the second page of this section and there's a post titled "Which is the Best Year for a w210 Diesel" by BigDaddyBenz and there's some good member comments about the w210 diesels.

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'89 260e (212K Mi.), '92 400e (208K Mi.), '92 400e (not a misprint) (146K Mi.), '95 C220, '81 240D--Sold