Coolant Contamination of Diesel Engine Oils

This paper reports results from an extensive literature search as well as a comprehensive laboratory and engine dynamometer evaluation as to the effects of coolant and moisture on lubricating oils and heavy duty diesel engines. The reactions of glycol from engine coolant when it contaminates the oil and the detection of coolant in the crankcase are dealt with at length, as well as the effect of coolant and moisture on bearings. Finally, a laboratory bench test to evaluate a heavy duty lubricant's moisture tolerance is proposed.