Myth 1: the higher the viscosity of engine oil, the better
Generally speaking, from the point of view of lubrication, the viscosity is too high, and the oil starts slowly when the loading mixer starts. However, when the vehicle starts and the oil is not fully heated up, the wear of the vehicle is the biggest. One of the functions of the oil is to cool the engine. We know that the engine coolant is mainly responsible for cooling the parts around the upper combustion chamber of the engine.
In addition, all moving parts rely on oil to dissipate heat. If the viscosity is too high and the oil flow per unit time is small, the cooling effect of parts will be much worse. Accordingly, the service life of the parts will be greatly reduced if the parts are not cooled well. Therefore, the oil to choose the appropriate viscosity is the greatest protection for the engine.
Myth 2: synthetic oil viscosity is thinner than mineral oil
Many people will think that the same viscosity grade synthetic oil viscosity is too thin, oil pressure will be bad, in fact, this is the characteristics of synthetic oil. Therefore, the engine oil viscosity requirements are low temperature start and low temperature operation, the viscosity must be low enough to reduce wear. The proper viscosity must be ensured for the high temperature operation of the self loading mixer engine to ensure the sufficient lubrication effect. There is an evaluation index of engine oil: viscosity index. The higher the viscosity, the higher the index, which indicates the better stability of the oil. The viscosity index of fully synthetic oil can reach more than 160, while the viscosity index of ordinary mineral oil generally does not exceed 100. Therefore, the advantages of synthetic oil can only be shown under high engine temperature and low ambient temperature.
What viscosity grade oil is selected from the engine of charging mixer is determined by engine temperature, fit clearance of engine parts and shear strength of parts.
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