If the engine was running when the car rolled, It is very possible that there are bent rods. I have replaced several Om606 Diesel engines that have
bent rods from oil being in the wrong place at the wrong time.
Like being sucked throught the PCV system and hydrolocking the engine.
(jiffy lube pumping 8qts into valve cover and firing up asap.)
Pull the head and check piston deck height to see if there is a difference in
height on 3 and 6. Cylinder wall wear may be heavy in those 2 holes as well.
Junk yard motor may be in your future.
DR.D

__________________
Dr.Diesel -
Shop Foreman
Master Guild Mercedes-Benz Technician.

Think the dealer is expensive? Do you know how much it costs to train a dealer tech? Or buy the required MB special tools to have on hand?