What brand of oil are most of you all using in your Polaris Sportsman? I used Rotella T 5w-40 synthetic (blue jug) in my 2008 Arctic Cat 650 H1 when I had it. Also used a WIX oil filter. I use the Rotella 15w-40 and WIX oil filters for my Suzuki Eiger 400 also. The Rotella is JASO MA approved oil for motorcycles and ATV's. Seeing that Polaris has it's own separate transmission I was just wondering if it's ok to use other brands of oil besides the Polaris brand recommended oil.