Polaris 2011 Ranger 400 - Manual (Page 60)

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MAINTENANCE
Engine Oil
Always check and change the engine oil at the intervals outlined in the
Periodic Maintenance Chart beginning on page 50. Always change the
oil filter whenever changing oil.
WARNING! Vehicle operation with insufficient, deteriorated, or contaminated
engine oil will cause accelerated wear and may result in engine seizure,
accident, and injury. Always perform the maintenance procedures as outlined in
the Periodic Maintenance Chart.
Oil Recommendations
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. See page 102 for the part numbers of POLARIS
products.
NOTICE: Mixing brands or using a non-recommended oil may cause serious
engine damage. Always use the recommended oil. Never substitute
or mix oil brands.