A, high temperature influence
①oil in high temperature environment for a long time, can oxidation failure, appear the phenomenon of black, thicken.
② the internal corrosion of oil content increase, such as engine working in the formation of the acid, etc.
③carbon deposit, the increase of sludge, such as coating material.
(2) the impurities
Mainly comes from the dust in the air, the metal abrasive, leakage (fuel, water, etc.), lubricating oil oxide, and material from the burning of fuel, etc.
(3) the additive failure
Some failure or run out of lubricating oil for the additive performance degradation. For example of antiwear agent in lubricant are used up, can reduce abrasion resistance.
(4) the viscosity index improver
Because of its organic molecules long chain rupture, no longer has the viscosifying effect.
(5) base oil
