![]() ![]() ![]() (The calculator on this site is for informative purposes. If values are used other than 40C and 100C, ASTM D341 is applied before calculating the viscosity index. Calculator for viscosity index (VI) according to ASTM D2270 and ISO 2909. If you have the viscosity in centiPoise, divide the centiPoise value by the oil's viscosity to get centiStokes. Standard practice for calculating viscosity index from kinematic viscosity at specific, free temperatures. This calculator uses centiStokes (cSt), which are equivalent to mm^2/s. Higher quality oils tend to have higher viscosity indices, and while there are ranges in every category, a synthetic oil will tend to have a much higher viscosity index than its conventional counterpart. If you know the viscosity of your oil at 40✬ and 100✬ (100✯ and 212✯) you can easily calculate its Viscosity Index. Oil needs to flow when cold, but not get too thin and runny when it's warm. ![]() That is, oil with a high VI will retain their viscosity over a wider temperature range and work as designed in both hot and cold environments.Ī higher VI is important when your machine will experience a big change in operating temperatures. The higher the viscosity index, the lower the change in viscosity. The degree to which the viscosity decreases determines the Viscosity Index (VI). The viscosity of an oil decreases as temperature increases. Viscosity Index and what you need to know ![]()
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