Does it have an MB rebuilt engine? They seem to have the best reputation for this troubled engine. There were a few updated rods designs, but to my knowledge there are no guarantees on any of the 350 engines.

Anecdotally, MB rebuilts do well, and engines that have already accrued higher mileages are said to be the "good ones". I don't know of any way to predict the future of one of these, but a compression test before you buy would be a very good thing to do.

Not all of these engines failed, but again, anecdotally it seems that 25 - 35% did, a ridiculous failure rate.

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Chief

1991 350SD