The rhino motors will pump a little out into the filter box while running high RPM for extended periods. That is normal for the motor, but many add a siphon brake to the line, to keep this from happening. If there is A LOT of oil, then you could have a problem internally in your motor. Worn rings maybe.
A forum community dedicated to Yamaha Rhino owners and enthusiasts. Come join the discussion about performance, modifications, troubleshooting, maintenance, classifieds, and more! Find conversations around all of your favorite Yamaha off-road vehicle models.