Viscosity index

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What Wikipedia says

The viscosity index (VI) is an arbitrary, unit-less measure of a fluid's change in viscosity relative to temperature change. It is mostly used to characterize the viscosity-temperature behavior of lubricating oils. The lower the VI, the more the viscosity is affected by changes in temperature.

Excerpt from the Wikipedia article “Viscosity index”, under the CC BY-SA 4.0 license. Read the article on Wikipedia