investigation on the correlation between dynamic viscosity of engine lubricant and its service life

In this article, after a comprehensive study of the related literature, regarding the effect of dynamic viscosity on condition monitoring by oil, as well as the effect of oil layer thickness on the interactions between the ring, bush and piston and their relationship with dynamic viscosity, the hypothesis was proposed that whether oil life may have a logical and meaningful relationship with dynamic viscosity or not.therefore, a comparison between dynamic viscosity at different temperatures related to two healthy dump trucks belonging to mobin mining company was targeted. thus, oil samples were prepared at 50, 100, 150 and 200 hours of operation and then their dynamic viscosity was calculated by alborz tadbir karan laboratory at different temperatures (20, 40, 60, 80 and 100 degrees celsius) and then these data they were compared in the form of tables and graphs.finally, it was proved that this theory cannot be true.