Polaris 2013 ATV Sportsman 500 Tractor INTL - Manual (Page 76)

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MAINTENANCE
Engine Oil
Oil Recommendations
Always change the oil filter whenever changing oil.
POLARIS recommends the use of POLARIS PS-4 PLUS Performance
Synthetic 2W-50 4-cycle oil or a similar oil for this engine. Oil may
need to be changed more frequently if POLARIS oil is not used. Always
use 2W-50 oil. Follow the manufacturer's recommendations for ambient
temperature operation.
NOTICE: Mixing brands or using a non-recommended oil may cause serious
engine damage. Always use a recommended oil. Never substitute or
mix oil brands.
Oil Specifications
Lubricant Capacity Drain Plug Torque
PS-4 PLUS Performance
Synthetic 2W-50 4-Cycle Oil
1.9 liters 19-23 N-m