Is yours a 2020 or newer?
Mine is a 2019 and my owner's manual states 10w-40 Dexos 2. I usually get that at any auto parts place. The engine is a GM Ecotec, I've used an AC Delco PF457G oil filter.
Also for about $80 you can get the whole kit and kaboodle on Amazon. Just search for "oil change kit" and that will include a oil filter housing which my AC Delco does not.

 

I have the 2021 with the Polaris engine. The manual states the PS4 5W 50 synthetic oil.
Thank you.

 

I have the 2021 with the Polaris engine. The manual states the PS4 5W 50 synthetic oil.
Thank you.

If I remember correctly the new engine is basically 2 of their ATV engines bolted together. On Amazon there are kits for the ATVs, you would just need to buy more oil.

Amazon.com: Polaris Off Road Full Synthetic Oil Change Kit, 2 Qts. of PS-4 Extreme Duty Engine Oil and 1 Oil Filter : Automotive

Buy Polaris Off Road Full Synthetic Oil Change Kit, 2 Qts. of PS-4 Extreme Duty Engine Oil and 1 Oil Filter: Engine Oil - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com