That's the infamous diesel screw-up engine, is it not. This one had
piston crank arms that warped and skewed the pistons in the cylinder,
causing scoring on the cylinder walls. That said, I've heard of some
of these needing an overhaul at 70K, so 310K's pretty good. Overhaul
won't be cheap, though. I've heard around $8K.
Original owners with problems got free engine rebuilds on these models
1992-1995 300SD and 350SD.
Is that right?