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Thank you for that. So if it's just a different way to measure viscosity, the reason for the manufacturer calling for an ISO gear oil isn't for any particular performance issue?

I'm fixing to do maintenance on my S680 combine and most of the final drives and gear cases call for GL-5 but two call for an ISO VG 460 gear oil. I've never had anything that used that kind of oil so I'm not familiar with it. What conditions would be present that require that kind of oil...