There is really no substitute for much googling and internet reading. The subject of Viscosity Index like many things is very difficult to explain simply. I've been reading BITOG for some time but this is my first post. I used the VI calculator at Widman's and not all match from the published specs from the supplier's web site. 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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