As Sixto mentioned, the '92-'93 300SD is actually a 350SD, but MBUSA renamed them apparently to escape the bad reputation of the 3.5L engine.

I have had 2 3.5L "rod benders", one in a '91 which was a fantastic car with no problems at 250k miles, the other in a '93 300SD, with no engine problems, but it apparently has the abovementioned factory reman engine.

If the car isn't burning oil or having problems at 200k miles, chances are it'll be fine if you don't overheat, and pay close attention to any other abnormal condition. If it were going to fail, it likely would have by now.

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Gone to the dark side

- Jeff