Example: SAE 140 gear oil is required for a differential unit. Cross to ISO 460. If a SAE 90 is required, use ISO 220 oil. If a 90W-140 is called for, ISO 320 might be correct for the application. Note how SAE Crankcase oil classifications are in a different band than the SAE gear oils. An SAE 10W-30 would be an ISO 32-100. W in SAE nomenclature stands for 'Winter'.
Oil viscosity
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Keith Clements
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Oil viscosity
This chart shows the relationship between SAE and ISO (International Standards Organization) classifications , plus the AGMA (American Gear Manufacturer's Association) grades for gear oils.
Example: SAE 140 gear oil is required for a differential unit. Cross to ISO 460. If a SAE 90 is required, use ISO 220 oil. If a 90W-140 is called for, ISO 320 might be correct for the application. Note how SAE Crankcase oil classifications are in a different band than the SAE gear oils. An SAE 10W-30 would be an ISO 32-100. W in SAE nomenclature stands for 'Winter'.
Example: SAE 140 gear oil is required for a differential unit. Cross to ISO 460. If a SAE 90 is required, use ISO 220 oil. If a 90W-140 is called for, ISO 320 might be correct for the application. Note how SAE Crankcase oil classifications are in a different band than the SAE gear oils. An SAE 10W-30 would be an ISO 32-100. W in SAE nomenclature stands for 'Winter'.
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