Polaris 2011 FS IQ Widetrak Owner's Manual page 89

Engine Oil
Always check and change the engine oil at the intervals outlined in the
Periodic Maintenance Table beginning on page 82. Always change the
oil filter whenever changing oil. See page 135 for the part numbers of
POLARIS products.
Oil Recommendations
POLARIS recommends the use of Performance Synthetic 4-Stroke oil
(PS-4 or PS-4 Plus) for this engine. PS-4 has been specially formulated
for use in POLARIS 4-cycle snowmobile engines. It's a fully synthetic,
high performance, multi-viscosity oil designed to provide the ultimate in
lubrication performance and protection.
Oil may need to be changed more frequently if POLARIS PS-4 oil is not
used. Follow the manufacturer's recommendations for ambient tempera-
ture operation.
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.
MAINTENANCE
85