Originally Posted by Maxbumpo

Rod bender: If no evidence that it has had the head gasket replaced or the engine replaced, then it is a roll of the dice. You could immediately have the head gasket replaced, and while the head is off measure the piston heights to make sure the #1 piston rod isn't already bent.

Worse case scenario, engine is toast, you swap in an OM606 turbo with intercooler, keeping your OM603 mechanical injection pump. You'll get a nice bump in power and a far more reliable engine with more power and better mileage.