![]() Such de-tuning led to an 10% increase in fuel consumption over earlier model engines. One way this was achieved was by effectively 'de-tuning' the old motor by retarding the ignition timing by several degrees and thus reducing combustion temperatures and NOx emissions. With the introduction of Euro 1 in 1992, designers and engineers had to find a way to reduce diesel motor emissions over its predecessor. As a result, the OM4XX series share many similar (not to be confused with identical) components which date as far back to the very early Mercedes Benz OM401 and 402 diesel engines. ![]() The Mercedes Benz SK were available with the ever popular OM44X series engines, which were an evolution from the highly respected OM42X series used in the predecessor NG chassis. The focus was on better aerodynamics which would yield better fuel economy in testing. In 1994 the SK series, which apart from the upgraded engines was still based on the NG series from 1973, was facelifted for the last time with a new front design. BeiBen Truck 2538 dump truck based on Mercedes-Benz SK in Zhengzhou, Henan Province, China ![]()
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