Yamaha GRIZZLY 660 YFM66FGW Owner's Manual page 145

Engine oil:
Type:
SAE5W30 or SAE10W30 or SAE10W40 or SAE15W40
or SAE20W40 or SAE20W50
-20˚ -10˚ 0˚
10˚
5W/30
10W/30
Recommended engine oil grade:
API service SE, SF, SG type or higher
Engine oil quantity:
Without oil filter cartridge replacement:
1.90 L (2.01 US qt) (1.67 Imp.qt)
With oil filter cartridge replacement:
2.00 L (2.11 US qt) (1.76 Imp.qt)
Final gear oil:
Type:
SAE80 API GL-4 Hypoid gear oil
Quantity:
0.25 L (0.26 US qt) (0.22 Imp.qt)
20˚ 30˚ 40˚ 50˚C
10W/40
15W/40
20W/40
20W/50
Differential gear oil:
Type:
SAE80 API GL-4 Hypoid gear oil
Quantity:
0.28 L (0.30 US qt) (0.25 Imp.qt)
Cooling system:
Coolant reservoir capacity (up to the maximum level mark):
0.30 L (0.32 US qt) (0.26 Imp.qt)
Radiator capacity (including all routes):
1.80 L (1.90 US qt) (1.58 Imp.qt)
Air filter:
Air filter element:
Wet element
Fuel:
Recommended fuel:
Regular unleaded gasoline only (EUR)
Unleaded gasoline only (AUS)(NZL)
Fuel tank capacity:
20.0 L (5.28 US gal) (4.40 Imp.gal)
Fuel reserve amount:
3.5 L (0.92 US gal) (0.77 Imp.gal)
Carburetor:
Manufacturer:
MIKUNI
Type x quantity:
BSR42 x 1
Spark plug (s):
Manufacturer/model:
NGK/DPR8EA-9
Spark plug gap:
0.8–0.9 mm (0.031–0.035 in)
10-2
10