Apparently Polaris is watching the forums or just noticing they're not selling as much oil to maintain the number of quads they sell (or figure people aren't doing the maintenance on them).
They now have a brochure out telling you to use their oil and why.

Specially formulated ATV oil vs. automobile oils.
They mention RPMs, temperatures, condensation and the type of extreme use subjected to quads etc..

I believe it is more directed at wet clutch type manual quads in general but includes Utility machines.

I have a PDF file of it if interested.

Jim