Using Pennsylvania crude as a benchmark for low viscosity and Texas Gulf crudes for high viscosity, the team developed a method for calculating changes in internal resistance to flow relative to temperature. The concept of Viscosity Index was first developed in the 1920s by a pair of American chemists. VI is an independent parameter and is used to calculate how viscosity will change when exposed to temperatures higher or lower than 40☌. Viscosity Index vs ISO Viscosity GradeĬontrary to popular belief, Viscosity Index is not part of ISO Viscosity Grade, which calculates viscosity at a standard temperature of 40☌. While VI is often an overlooked parameter when selecting lubricants, it can offer valuable insight into how the lubricant will behave when in use. Temperature-triggered changes in the viscosity of a lubricant is known as Viscosity Index (VI). Viscosity can vary enormously between different lubricants and temperature often plays a key role in changing internal resistance to flow.
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