Deterioration in Physical Engine Oil Properties after Different Trip Length

Abstract

Fresh engine oils or engine lubricants lose some of their properties during service, engine lubricant deterioration leads to change in oil properties, which ultimately have effect on engine overall performance. Therefore, it is very crucial to specify used engine lubricants at various conditions to check the performance and ability of used oils, which in turn protects engine parts and designs new formulations to produce better type of engine oil or improve the existing oil. In this study, most significant parameters such as kinematic viscosity, flash and fire points were chosen to find out physical properties deterioration in engine oil properties. The oil samples were multigrade fully synthetic with SAE gradation 10W-30 grand Eco drive is used in 5 different passenger cars. Having information about these properties are crucial chemical and physical behaviors of engine oils and for keeping its lifecycle. The results of the study show that after using it for more than 10,000 km, 10W-30 Delta NL motor oil brand (special synthetic with API SL) oil properties such as viscosity at cold ignition, 40 °C and 100 °C dropped 22.92%, 23.61% and 26.13% respectively. In addition, both flash point and fire point decreased 15.6% and 14.22%%, respectively, from the base properties. According to the test results this type of engine oil can be used for 10,000 km.