![]() If you have the viscosity in centiPoise, divide the centiPoise value by the oil's viscosity to get centiStokes. This calculator uses centiStokes (cSt), which are equivalent to mm^2/s. Andrade’s method is based on the observation that the logarithm of viscosity plotted vs. If you have any questions regarding viscosity grades and selecting the correct viscosity lubricant, please contact your Motor State Distributing sales representative at (800)772-2678 or. 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. In return, you will prevent wear, improve fuel economy, and make more horsepower. If you know the viscosity of your oil at 40✬ and 100✬ (100✯ and 212✯) you can easily calculate its Viscosity Index. Synthetic fluids typically have much higher VI numbers compared to conventional fluids, meaning they provide improved protection to critical components over a wider range of temperatures. Oil needs to flow when cold, but not get too thin and runny when it's warm. The Viscosity Index Test is based on the kinematic viscosity of the fluid at 40☌ (104☏) and 100☌ (212☏). ![]() 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). Typically, for a base oil, viscosity is lower as temperature is raised. The viscosity of an oil decreases as temperature increases. Viscosity index (VI) is an empirical number indicating the effect of temperature on viscosity. Viscosity Index and what you need to know
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