While the VI has no units of measure, it is well known that the viscosity index of a conventional mineral oil is between 95 to 100. Thus, the viscosity index measures the ability of an engine oil to resist becoming thinner at high temperatures. The viscosity changes with temperature to ensure protection and operability under all circumstances. Oil viscosity index explained A higher viscosity implies a slower flow and a thicker fluid. What does a high viscosity index mean for an oil? The viscosity index is important in order to ensure, e.g., the best possible lubrication for machinery, as temperature changes occur during operation. It allows for a better comparison of the viscosity behavior of different oils based on temperature. The higher the VI, the more stable the viscosity remains over temperature fluctuations. It is mostly used to characterize the viscosity-temperature behavior of lubricating oils. The viscosity index (VI) is an arbitrary, unit-less measure of a fluid’s change in viscosity relative to temperature change.
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