Oil analysis is the main condition monitoring technique for reciprocating machinery maintenance and fault diagnosis. The object of this research was to choose and to investigate the best oil for Dump Truck HD325-5, used for transportation of minerals, by oil condition monitoring. This was achieved by analysing different oil samples after use in Dump Truck HD325-5. The oil analyses were initially carried out at regular intervals during life. A series of tests were then conducted during the operating hours of the machine. Oil samples were regularly collected. Numerical data produced by oil analyses were compared with those from another sample in order to quantify the effectiveness of the results of oil condition monitoring technique. The results from this article have enhanced understanding on the dependent and independent roles of oil analyses in predicting which oil is more suitable for a machine in working condition.
