Viscosity is an important basic features that must be taken into account as a priority early in the oil pump to engine. Low viscosity machine oil will provide some lubrication film. One cannot bear much weight, but it can be inserted according to the sections that need fast lubrication and cooling. Engine does not have to work so hard, and fuel economy. Conversely, engine oil, high viscosity, lubrication film thickness so it can absorb the pressure better. But energy in shear more oil film. The cooling is slow if a car may cause the car not to rush off and wasted fuel.
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