2010 Polaris Sportsman 850 Service Manual, Page 18Get this manual
MAINTENANCE Maintenance Quick Reference
III# Item Lube RecMethod Frequency Change after 1st month or first 20 hours of operation, 100 hours thereafter; Change more often (25 hours) in severe duty conditions or short trip cold weather operation Check level every 25 hours; change fluid yearly Check level daily, change coolant every years
Engine Oil
Polaris PS-4 PLUS Synthetic Engine Oil