Engine Oil - Yamaha ULTRAMATIC GRIZZLY 660 YFM660FS Owner's Manual

Engine oil

Make sure the engine oil is at the specified level.
Add oil as necessary. (See pages 8-33–8-45.)
CAUTION:
_
G
In order to prevent clutch slippage (since
the engine 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.
G
Make sure that no foreign material enters
the crankcase.
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Recommended engine oil type and quantity:
See page 10-2.
5-15
EBU10842