I like the engine all in all, but one does need to pay close attention. Quicker and smoother than the OM617, better mpg, but perhaps more delicate.

I had no way of knowing of course, but in hindsight the preventive maintenance I really should’ve done was to replace the original radiator with the all aluminum aftermarket unit. The radiator will self-destruct eventually.

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1986 300SDL, 362K
1984 300D, 138K