Yamaha YFM660FS Owner's Manual page 177

Model
Engine oil:
Type
Recommended engine oil classification
Quantity:
Without oil filter cartridge replacement
With oil filter cartridge replacement
0° 10° 30°
YAMALUBE 4 (10W30) or SAE 10W30
SAE 5W30
-20° -10° 0°
API Service SE, SF, SG type or higher
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.
1.9 L (1.67 Imp qt, 2.01 US qt)
2.0 L (1.76 Imp qt, 2.11 US qt)
10-2
YFM660F
50° 70° 90° 110°
YAMALUBE 4 (20W40) or SAE 20W40
10° 20° 30° 40°
1
130°F
2
3
4
5
50°C
6
7
8
9
10
11
12
13
14