Yamaha GRIZZLY 660 YFM66FAV Owner's Manual page 436

Engine oil:
Quantity:
Without oil filter cartridge replacement
With oil filter cartridge replacement
Final gear case oil:
Type
Quantity
Differential gear case oil:
Type
Quantity
Radiator capacity (including all routes):
Air filter:
Fuel:
Type
Fuel tank capacity
Fuel reserve amount
Carburetor:
Type / quantity
Manufacturer
Model
1.9 L
2.0 L
SAE80 API GL-4 Hypoid gear oil
0.25 L
SAE80 API GL-4 Hypoid gear oil
0.28 L
1.80 L
Wet element
Unleaded gasoline only
For Europe: Regular unleaded gasoline only with a
research octane number of 91 or higher
20 L
3.5 L
BSR42 / 1
MIKUNI
10-3
YFM66FA