BenzWorld Junior Member
Date registered: Jan 2008
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OM606 Turbo Diesel - Same Story as Oldsmobile Diesel V8?
Is it true that the OM606 turbo diesel as used in the S350 is in the same boat as the Oldsmobile diesel 5.7 V8, in terms of reliability?
The Olds diesel story is legendary: despite not being a 100% relation to the gas 5.7 "Rocket" V8, GM at the time needed a diesel small enough to fit in the same space as the gas version. The problems of the engine amounted to, among others:
1. The number of bolts for the diesel version being the same as to the gas version (the diesel version needed more stud bolts).
2. The original head bolts were not strong enough to withstand daily usage (this was eventually corrected; although the ARP aftermarket bolts are recommended nowadays).
3. The total lack of a factory-installed fuel-to-water separator.
4. Ironically, the 4.3 V6 version of this engine sold from 1982-85 was more reliable since it was based on the improved DX block of mid-1981, and had more head bolts per cylinder.
So, folks, how many surviving W140 series S350s are intact?