I have ran 10w30, atf, royal purple gear oil, belray gear saver, golden spectro trans oil, and maxima mtl 75w, 80w, and 85w trans oil in my Banshee. Only one I recommend, and would use is Maxima MTL 85w endurance fluid. Other than that my trans has hit false neutrals off the bat, or the oil doesn't seem to last longer than 4 hours then it hits false neutrals. Or while running those other oils I have majorly overheated a clutch and or blown up a set of frictions.
I do have to change my oil after 2 weekends of riding, but other than that it works awesome.