keywords: Specific heat capacity, cooling rate, SAE20W-50, engine oil
This study examined specific heat capacities and rates of cooling of different SAE20W-50 multi-viscosity engine oil samples (Amasco oil, A-Z oil, Express oil, Oando oil, Jezco oil, Total Classic and Total Quartz) using method of mixture and Newton’s law of cooling, respectively. Results showed that, Oando oil had the highest value of the cooling rate, K followed by A-Z and Total Classic oils while other oil samples had closely related values of K. This implied that Oando, A-Z and Total Classic oils have the best cooling abilities. Also, A-Z oil had the highest value of specific heat capacity while Oando oil had the lowest value indicating that A-Z oil is the best absorber of heat. From the analysis of specific heat capacities and rates of cooling of the samples, it is suggested that A-Z, Oando and Total Classic oil will enhance the performance of the engine by reducing wearing and tearing and prevent hard starting.