Temperature not only plays an decisive role in the oxidation of lubricating oil, but also the important factors that affect generation engine parts surface sediments. Temperature too high or too low will result in different properties of sediment.

The first ring grooves in the piston of high temperature, the temperature is the key to the identification of lubricant performance level. If the temperature of the ring groove less than 20 ℃, low power, such as old car engines, with appropriate seized of refined oil can guarantee the normal work of the piston. When the first ring groove after more than 20 ℃, the temperature of lubricating oil will generate glial, has caused the risk of sticky ring, need to add additives in oil to prevent sticking.

If the temperature over 250 ℃, sticky ring will become a serious problem, highly efficient detergency of lubricating oil is needed to ensure the safe running of the engine.

Temperature on the influence of the connecting rod bearing and the crankshaft bearing is mainly bearing mechanical strength and corrosion of lubricating oil. Bearing temperature below 10 ℃, the strength of the bearing alloy material will not have obvious change, lubricating oil and no serious chemical etching of the danger. Bearing and around the oil temperature at 10 ~ 140 ℃, the lubricating oil has high corrosion resistance, bearing only from corrosion and reduce its mechanical strength. Such as oil temperature over 140 ℃ will appear at the same time bearing mechanical strength reduction and alloy material corrosion problems.

Crankcase oil temperature on the formation and properties of sediment has a very close relationship. When the oil temperature is lower than 60 ℃, might generate sludge at low temperature, condensation of water in oil can reduce some functional additives. Oil from the oil temperature 60 ℃ to 140 ℃, the oxidation of gradually intensified, oxidation corrosion inhibitor are needed to enhance oil oxidation stability. After the crankcase oil temperature over 140 ℃, some oxidation corrosion resistant additives began to be destroyed (decomposition), then use high temperature resistant additives to improve the stability of the oil and prevent oil viscosity increases sharply.

The temperature of the valve chamber cover less than 50 ℃, the valve will produce condensate indoor, prompt production of lubricating oil sludge at low temperature corrosion caused by part.