Yamaha GRIZZLY ULTRAMATIC YFM660FP Owner's Manual page 419

Model
Compression ratio
Starting system
Lubrication system
Engine oil:
Type
Recommended engine oil classification
9.1 :1
Electric and recoil starter
Wet sump
-20˚ -10˚ 0˚
10˚
5W/30
10W/30
API Service SE, SF, SG type or higher
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-fric-
tion additives which will cause clutch and/or
starter clutch slippage, resulting in reduced com-
ponent life and poor engine performance.
10-2
YFM660FP
20˚ 30˚ 40˚ 50˚C
10W/40
15W/40
20W/40
20W/50
10