![]() 120, whereas, the synthetic based oils have a VI of nearly 250. High- quality mineral oil has a VI of approx. ![]() The temperature used for measuring the viscosity is 40℃ and 100℃. In this process, the reference oil used is typically a high-quality oil that has a very low rate of change in viscosity with regards to temperature. It is calculated by comparing the change in viscosity of an oil with temperature to the change in viscosity of a reference oil with the same temperature change. Viscosity Index (VI) is a measure of the rate of change of a unit of viscosity with respect to temperature. Viscosity Index (VI) is an important property of lubricating oils as it indicates how well the oil will maintain its viscosity over a wide range of temperatures.
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