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Although allowable amounts of glycol contamination in diesel engine oil, no
research has been conducted on how these levels and varying loads affect engine
performance. The research used a four-stroke diesel engine to investigate the effect of
different glycol contamination levels (0, 120, and 220 ppm) under two engine loads (4.5
and 9 kW). Brake specific fuel consumption, brake thermal efficiency, friction power, and
exhaust gas temperature were measured to determine the engine performance. The
experiment used the factorial arrangement in a completely randomized design (CRD) with
three replicates. Increasing the contamination levels from 0 to 120 and then to 220 ppm
under constant engine load significantly increased brake specific fuel con
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