What oil for gearboxes

[Coach]

I've heard that the factory oil in the gearboxes isn't really very good. What are you mechanically minded owners changing it over to?

[de dee]

what does your manual say ?  in my scooter I use # 90 full syn. oil , you can use it any time ,no break in time,  for gear boxes,

[airshot]

   I am assuming you are referring to the differential gears?  On my side by side I replaced the factory gear lube with full synthetic 75-140 gear oil. Most differential gear cases require an 80-90wt gear oil. By using a full synthetic gear oil you can use a broader weight lube as the syn products do not get thick in the cold like conventional dino oil does but they still control wear like a thicker oil does and even better under severe conditions.

[beermak]

I use synthetic manual transmision fluid 75w90. Change it every other oil change.

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[Driemeyer25]

We use 80w-90w and Arctic Cat had there own oil. But you can use any brand.