![]() Of course, in looking at other threads before I posted, there is the debate on whether high VI is really meaningful measurement. The MC is the odd one here with a much higher VI. I was just comparing and for a simple ratio I could not do the math. I would expect depending on VI improvers they would not all react to temperature the same. I was expecting a non-linear like a post but another person said how can two data points give a curve (straight or not) which leads to my other question is how can two oils have similar end points and have diff VI unless they have non-linear relationships. The VI is simply reported as a numerical value that has no units. For example, a higher viscosity index indicates that the kinematic viscosity of the lubricant will decrease very little when the temperature is increased. ![]() The viscosity index (VI) is an arbitrary measure of the variation in the kinematic viscosity of a petroleum product due to changes in temperature between 40☌ and 100☌. The BITOG chart I was looking at was this:Ĭalculating Viscosity Index from Kinematic Viscosity at 40☌ and 100☌
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