I filled my UTU with 85W90 about 10 years ago - it seems to work fine.
The stuff in the rear end when I got the tractor was extremely stiff - almost a solid. In colder weather the shift lever was impossible to move until the engine had run 5 - 10 minutes with the clutch engaged. Replacing it with 85W90 eliminated the problem, and the transmission still runs nice and quiet.
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