Index; Fuel Octane Rating - Subaru 2006 Impreza WRX Owner's Manual

Fuel:
2.5-liter non-turbo models
Use only unleaded gasoline with an octane rating of 87 AKI or
higher.
WRX
Use premium unleaded gasoline with an octane rating of 91 AKI or
higher. If premium unleaded gasoline with an octane rating of 91
AKI is not available, regular unleaded gasoline with octane rating
of 87 AKI or higher may be temporarily used. For optimum engine
performance and driveability, it is required that you use premium
grade unleaded gasoline with an octane rating of 91 AKI or higher.
WRX-STI
Use super-premium unleaded gasoline with an octane rating of 93
AKI or higher. If super-premium unleaded gasoline with an octane
rating of 93 AKI is not available, premium unleaded gasoline with
octane rating of 91 AKI or higher may be temporarily used. For op-
timum engine performance and driveability, it is required that you
use super-premium grade unleaded gasoline with an octane rating
Cold tire pressure:
Item
Tire size
Wheel size
Pressure Front
Rear
Temporary spare Size
tire
Pressure
GAS STATION REFERENCE
2.5i, OUTBACK SPORT
P205/55R16 89V
16  6 / JJ
1
2
33 psi (230 kPa, 2.3 kgf/cm )
2
30 psi (210 kPa, 2.1 kgf/cm )
2
T135/70 D16
of 93 AKI or higher.

Fuel octane rating

This octane rating is the average of the Research Octane and Mo-
tor Octane numbers and is commonly referred to as the Anti Knock
Index (AKI). Refer to “Fuel” section in this manual.
Fuel capacity:
15.9 US gal (60 liters, 13.2 Imp gal)
Engine oil:
Use only API classification SM with the words “ENERGY CON-
SERVING” and the ILSAC certification mark (starburst mark) dis-
played on the container.
Engine oil capacity:
4.2 US qt (4.0 liters, 3.5 Imp qt)
WRX
215/45R17 91W
17  7 JJ
33 psi (230 kPa, 2.3 kgf/cm
2
32 psi (220 kPa, 2.2 kgf/cm
2
60 psi (420 kPa, 4.2 kgf/cm
2
WRX-STI
225/45R17 90W
17  8 JJ
) 36 psi (250 kPa, 2.5 kgf/cm
) 30 psi (210 kPa, 2.1 kgf/cm
T135/70 D17
)
)
2
)
2