The Polaris CVT is an external unit. What you're talking about with the Valvoline CVT fluid is for automotive purposes where the belt is an internal part that comes in contact with the fluid. Polaris' CVT is a dry external operation and therefore the transmission is basically all gears and chains so a sufficient synthetic oil will be fine.
2012 Polaris Sportsman XP 850 H.O. EPS Limited Edition Orange Madness
Polaris Extreme Front and Rear Brush Guards
Polaris Composite Rear Rack Extender
K&N Air Filter w/ K&N Prefilter
Looney Tuned Slip-on Exhaust Black Finish
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Highlifter Axle Bar Kit