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The Society of Automotive Engineers (SAE) have established a numerical code for grading motor oils according to their viscosity from low to high. Single grade oils are designated 5, 10, 15, 20 and so on. Multigrade oils are designated 10-50 for example and must pass the grade requirement for both 10 and 50. Multigrade oils are designed to operate over a wide range of temperatures, from freezing conditions to temperatures created by hot operating engines

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How is the viscosity of an oil related to its SAE number?

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