Powered by the legendary five cylinder OM617, the sort of motor for which Mercedes-Benz earned their reputation as manufacturers of “million mile engines,” the W126 300SD was a classy and reliable ride, offering a frugal option for S-class owners not perturbed by a clackety-clack sound coming from the front end of their luxury car. This engine would be replaced in 1985 by the OM603 six cylinder unit (later enlarged to 3.5 liters) that, while offering more power, was susceptible to a number of very serious problems (a fault with the trap oxidizer – part of the emissions system – that could ruin the turbo, cylinder heads prone to overheating and cracking, bent rods and head gasket failures). So those looking for a diesel W126 would do well to consider an early, first generation car like this one.
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