Most owners have several misconceptions about the use of engine lubricants:
1, blindly use imported lubricants;
2, that the lubricating oil is black is bad;
3, only see the viscosity does not see quality;
4, mixed use of lubricants;
5, only add not replace.
Old cars use low-grade lubricants. Are you on the list?
During the use of lubricants, viscosity increases due to the formation of sludge. The phenomenon of viscosity reduction in the use of lubricating oil is due to the selection of low-viscosity base oils and the selection of more macromolecule polymers to increase the viscosity. During the use of lubricating oils, under the conditions of high temperature and high pressure for a long time, As a result, the molecular chain of high-molecular hydrocarbon polymers breaks, which results in a drop in viscosity. Therefore, the degree of viscosity change is related to the quality of the lubricant.
As for what engine oil is used, it depends on the climate and the working condition of the engine. For example, the temperature in the southern region is higher than that in the northern region, and the viscosity of engines using the same conditions in winter and autumn and spring is slightly higher. In addition, the gas engine operating temperature is tens of degrees higher than the temperature of the fuel engine. In order to maintain the high temperature oil film stability, the oil viscosity is required to be slightly higher, and at the same time maintaining the high temperature tightness between the piston and the cylinder of the old engine. Engine oils have better viscosity and viscosity stability.
In addition, to evaluate the quality of a lubricant, mainly depends on its viscosity stability, viscosity, thicker oil film, suitable for the old engine with a larger piston cylinder gap, the viscosity of the oil film is thinner, suitable for the piston cylinder A new engine with a small gap, at this time, high-viscosity oil must be used to fuel. However, whether the viscosity is large or small, the anti-oxidation and anti-deterioration properties of the oil must be good under high temperature conditions.
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