Yamaha RAPTOR YFM660R Owner's Manual page 124

CAUTION:
_
Be sure to use motor oils that do not contain
anti-friction modifiers. Passenger car motor
oils (often labeled "ENERGY CONSERVING II")
contain anti-friction additives which will cause
clutch and/or starter clutch slippage, resulting
in reduced component life and poor engine
performance.
_
Oil quantity:
Total amount:
2.3 L
Periodic oil change:
1.9 L
With oil filter replacement:
1.95 L
5-15