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Can one gear oil cover a number of viscosities like 75w-90, 80w-90 and 90 and why?

April 26, 2017cover Gear Oil viscosities

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Can one gear oil cover a number of viscosities like 75w-90, 80w-90 and 90 and why?

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Yes it can, the viscosity grades are not mutually exclusive, it is possible to blend a gear oil with multigrade characteristics such that it falls within, for example, the SAE 75W and the SAE 90 viscosity bands. A mulitgrade oil ( gear or otherwise ) is simply an oil which falls into more than one viscosity grade.