![]() Once the value of K is known, the viscosity can be determined by measuring the amount of time the test liquid flows between the two graduated marks. The second number is defined by how an oil flows when at higher. This measurement is related to how an oil flows when it is cold, such as at engine start-up. Viscosity Index (VI) is an empirical measure of how much the viscosity of a lubricating oil changes with a change in temperature the viscosity. Motor oil viscosity grades are based on a scale developed by the API (American Petroleum Institute) lubricant. The first number ends with the letter 'W', which stands for Winter. The viscosity index refers to how much the viscosity of a lubricant changes due to fluctuations in temperature. Viscosity is the resistance to flow of a fluid. ![]() There are two numbers that define the viscosity of an oil. Viscosity can be related to water and honey. ![]() The second number is defined by how an oil flows at normal engine. This measurement is related to how an oil flows when it is cold, such as at engine start-up. The first number precedes the letter W which stands for Winter. There are two numbers that define viscosity meaning. ![]() Where \(K\) is the value of a liquid with known viscosity and density such as water. The viscosity grade that’s printed on every bottle of engine oil determines how it will react to changes in temperature. The viscosity of an oil is measured by its resistance to flow. Oil viscosity is the measurement of the fluids resistance to flow. The viscosity of an oil is measured by its resistance to flow. ![]()
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