The exact time of oil change is nonetheless difficult to predict, but it is of great interest from an economic and ecological point of view. Generally, oil oxidation is a complex process and difficult to elucidate however, the degradation pathways can be defined for almost every type of oil because they mainly depend on the mechanical status and operating conditions. Engine oil experiences a number of thermal and oxidative phases that yield acidic products in the matrix consequently leading to degradation of the base oil.
