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Engines powered with biogas obtained from wastes obtained from a municipal waste water treatment plant were subject to studies. The engines powered the electric current generators. It was found, that after 800 operating hours, differentiation in the contents of iron, zinc and copper depending on the mode of their loading occurred in the engine oil. In the group of engines loaded in about 60% of power, higher contents of iron, copper and zinc in the engine oil than in the engines loaded in 85% of power, was found. Occurrence of other statistically important differences in the contents in oil of manganese, chromium and aluminum was found.

Impact of the operating time and loading of an engine with spark ignition powered with biogas on selected parameters of engine oil