the 5-50 is ok to use..most here use either the puralator or wix filters....fram just came out with a new filter its called the Ultra Synthetic...the buzz on the oil forums say it a great filter...better than most out now...but the cheaper ones I would pass on...I was at the auto store and they do have the Ultra thats fits polaris...but I have a few filters now to use up..but I will try one ...has great reviews