Polaris RZR RS1 2021 Owner's Manual For Maintenance And Safety page 104

MAINTENANCE
ENGINE OIL
OIL RECOMMENDATIONS
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
Ambient Temperature Range
-35° F to +100° F
(-37° C to +38° C)
0° F to 120° F
(-18° C to +49° C)
Oil may need to be changed more frequently if POLARIS oil is not used. Do not
use automotive oil. Follow the manufacturer's recommendations for ambient
temperature operation. Part numbers can be found in the POLARIS Products
chapter.
Mixing brands or using a non-recommended oil may cause serious engine
damage. Always use the recommended oil. Never substitute or mix oil brands.
Always check and change the oil at the intervals outlined in the Periodic
Maintenance Chart. Always use the recommended engine oil.
102
WARNING
Maintenance Chart.
NOTICE
Recommended Oil
PS-4 5W-50 4-Cycle Oil
PS-4 Extreme Duty
10W-50 4-Cycle Oil