Quote:
Originally Posted by dieselmania
... I have always heard about the rod bending but not sure which ones, or the exact reasons leading up to it.
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All the S class models with the 3.5 liter engine, so both 126 and 140 models. I think the cut-off for the 3.0 liter engine in the 126 is 1987?
The root cause seems to be faulty head gaskets + weak connecting rods. The MB replacement engines have improved head gaskets and rods.
If a car doesn't have a documented replacement engine from MB, it will need a new head gasket and if you want complete insurance to make the engine as long-lived as possible, replace the connecting rods as well. Keep all documentation to prove this work has been done in the event you want to sell the car or the engine later on.
Another very reasonable "upgrade" is an OM606 turbo engine from a '98 or '99 E300 Diesel, but keep the OM603 3.5 liter injection pump and associated throttle linkage. OM606 has 24 valves and an intercooler, so a big jump in power compared to the OM603, and better fuel economy.