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February 06, 2022
In fact, this statement is wrong: the viscosity of lubricating oil is not only the basis for the classification of lubricating oil, but also is related to the power of the engine, the degree of wear of the moving parts, the degree of sealing of the piston rings, the lightness of the cold start of the engine, and the temperature is closely related.
The viscosity of the oil is too large, the pumping performance of the oil is poor, and the oiling is too slow when the engine is started at a low temperature. At this time, temporary dry friction or semi-fluid friction is most likely to occur, which is the main reason for engine wear.
The viscosity of the oil is large, the frictional resistance of the friction surface of the parts increases, and the frictional power loss also increases. On the other hand, the resistance of the crankshaft to stir the oil will also increase, resulting in an increase in the loss of power inside the engine.
The oil viscosity is high, the fluidity is poor, the circulation speed is slow, the speed of removing heat from the friction surface is slow, and the cooling effect is poor. The circulation speed of the oil is slow, and the number of times passing through the filter is also less, and the worn metal chips, carbon particles, dust and other impurities cannot be taken away from the friction surface in time, which may easily cause the engine to heat up.
The viscosity of lubricating oil is small, it is not easy to form a thick enough oil film, the bearing capacity of the oil film is poor, and it is easy to be damaged under the load, so that the parts cannot be lubricated normally, which will increase the wear.
The viscosity of the lubricating oil is small, the sealing performance will be poor, and the cylinder will easily leak, which will not only reduce the power, but also easily cause the exhaust gas to escape into the crankcase, diluting and polluting the lubricating oil.
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