Ok thanks for the info! I think I will probably go with Maxima Oil and the Polaris Oil filter.Polaris filter is good. I did notice on the Maintenance manual there are two filters for the polaris. Both will fit but one is longer than the other. Amsoil filters are also very good.
I used Amsoil 5W 40 for my 2006 VW Tdi diesel. Close to every 40,000 miles cambuckets destroyed & and cam, needed to be replaced twice then I got rid of the piece of junk Car.I have 10,000 miles on my 2015 1000XP, most of it with the Amsoil and wix oil filters. Last oil change I tried Mobil 1 5w50 and it seems to be working well. Nothing but R2C air filters since new, as I spent the majority of those miles in the horrible central Oregon dust. I have yet to find a speck of dust inside the intake tube.
I use the Polaris (OEM) oil filter. And I change the oil every 50 hours.Filter every change? Not needed. Assuming you use a truly good filter.
Our crank cases are small for the power developed. We can contaminate the oil (usually fuel) somewhat easily. But ideally you're making very little metal or picking up little dirt. An oil analysis would tell you for sure. Anyway, the point is rarely is the filter going to be filled or even mildy compromised.
I change every other only because I change a bit early and don't want the oil mess. Mind you I'm using the best filter I can get too, so...