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How do gear oil, ATF and MTF viscosities relate to engine oil viscosities?

April 26, 2017ATF engine Gear MTF Oil relate viscosities

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How do gear oil, ATF and MTF viscosities relate to engine oil viscosities?

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Gear oils and engine oils are classified by 2 different viscosity grading systems. A 75W-90 gear oil, for example, is about the same viscosity as a 10W-40 engine oil. In theory ATFs and MTFs can be any viscosity as required by the OEM. In practice ATFs are approx. the same viscosity as a SAE 10 engine oil or a ISO 32 hydraulic oil. MTFs are about the same, possibly slightly thicker.