What type of transmission oil do I use for my ATV?

I have a Polaris Sportsman 450 auto. My owner's manual states that I should use Polaris Premium AGL Synthetic ';gearcase'; lubricant for transmission oil. Is there another type or brand that I can use for this? Also, does this oil get used for both the transmission and gearcase? Thank you.What type of transmission oil do I use for my ATV?
sorry


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