The way this is calculated is fascinating. From a big picture perspective, it represents the amount of time left before the oil in your engine no longer offers optimal protection of its internal components. 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. Oil life percentage is one of those readouts on a modern automobile that isn’t always so easy to understand. In other words, SAE 0W-40 will flow better than SAE 10W-30 when it’s cold as 0W is less than 10W. Where \(K\) is the value of a liquid with known viscosity and density such as water. Viscosity grade is a measure of oil viscosity: the lower it is, the lower the oil viscosity, and vice versa.
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