![]() ![]() The higher the intermolecular friction (longer molecular chains), the higher the viscosity.2003 C5 Corvette Ultimate Guide. Viscosity is determined by creating friction between the molecules from fluid movement. It is a crude measure of a lubricant’s molecular constitution from the standpoint of hydrocarbon chain size. We all know that viscosity is the single most important physical property of a lubricant. It stands alone as an independent lubricant performance differentiator. Some people think the viscosity index is incorporated in the ISO Viscosity Grade, but it is not. One reason is simply because it is poorly understood. Viscosity Serial Number DecoderViscosity Serial NumbersViscosity Serial Number Too often the viscosity index (VI) is disregarded as a lubricant selection parameter.
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