Subaru 2006 Impreza WRX - Manual (Page 365)

GAS STATION REFERENCE
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
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)
Cold tire pressure:
Item 2.5i, OUTBACK SPORT WRX WRX-STI
Tire size P205/55R16 89V 215/45R17 91W 225/45R17 90W
Wheel size 16  6 1 /
2
JJ 17  7 JJ 17  8 JJ
Pressure Front 33 psi (230 kPa, 2.3 kgf/cm 2 ) 33 psi (230 kPa, 2.3 kgf/cm 2 ) 36 psi (250 kPa, 2.5 kgf/cm 2 )
Rear 30 psi (210 kPa, 2.1 kgf/cm 2 ) 32 psi (220 kPa, 2.2 kgf/cm 2 ) 30 psi (210 kPa, 2.1 kgf/cm 2 )
Temporary spare
tire
Size T135/70 D16 T135/70 D17
Pressure 60 psi (420 kPa, 4.2 kgf/cm 2 )