Yamaha RHINO YXR66FSEW Owner's Manual page 427

Model
Compression ratio
Starting system
Lubrication system
Engine oil:
Type
Recommended engine oil classification
9.10 :1
Electric starter
Wet sump
-20˚ -10˚ 0˚
5W/30
API service SG type or higher, JASO standard MA
CAUTION:
In order to prevent clutch slippage (since the en-
gine oil also lubricates the clutch), do not mix any
chemical additives. Do not use oils with a diesel
specification of "CD" or oils of a higher quality
than specified. In addition, do not use oils labeled
"ENERGY CONSERVING II" or higher.
10-2
YXR66FSEW
40˚
10˚ 20˚ 30˚
10W/30
10W/40
15W/40
20W/40
20W/50
50˚C
10