What Is Viscosity And Viscosity Index?
The viscosity reflects the internal friction of the oil and is an indicator of the oiliness and fluidity of the oil. Under the premise of not adding any functional additives, the higher the viscosity, the higher the oil film strength and the worse the fluidity.
The viscosity index indicates the degree to which the viscosity of the oil changes with temperature. The higher the viscosity index, the smaller the viscosity of the oil is affected by the temperature, and the better the viscosity-temperature performance, and vice versa.