Polaris Trail Boss 330 Quadricycle - Manual (Page 68)

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MAINTENANCE AND LUBRICATION
Engine Oil
Polaris Premium 4 Synthetic Oil is the only oil recommended for use
in this engine. Use of another API certified “SH” oil is acceptable as
long as it’s 0W-40. Oil may need to be changed more frequently if
Polaris Premium 4 is not used. See page 103 for the part numbers of
Polaris products.
Always check and change the engine oil at the intervals outlined in the
Periodic Maintenance Chart beginning on page 61.
CAUTION
Using a non-recommended oil may cause serious engine damage.
Use only Polaris Premium 4 All Season Synthetic Oil or an API
certified 0W-40 “SH” oil. Never substitute or mix oil brands.