Subaru 2003 Impreza - Manual (Page 223)

IMPREZA(NA) A1850BE-A (ENGLISH)
Starting and operating
7-2
Fuel
CAUTION
Use of a fuel which is low in quality or use of
an inappropriate fuel additive may cause en-
gine damage.
J Fuel requirements
B 2.5 Liter models
The 2.5 Liter engine is designed to operate using
unleaded gasoline with an octane rating of 87 AKI or
higher.
B 2.0 Liter (turbo) models
The 2.0 Liter turbo engine is designed to operate
using premium unleaded gasoline with an octane
rating of 91 AKI or higher. If premium unleaded gas-
oline is not available, regular unleaded gasoline with
an octane rating of 87 AKI or higher may be tempo-
rarily used. For optimum engine performance and
driveability, it is recommended that you use pre-
mium grade unleaded gasoline.
B Fuel octane rating
This octane rating is the average of the Research
Octane and Motor Octane numbers and is com-
monly referred to as the Anti Knock Index (AKI).
Using a gasoline with a lower octane rating can
cause persistent and heavy knocking, which can
damage the engine. Do not be concerned if your
vehicle sometimes knocks lightly when you drive up
a hill or when you accelerate. See your dealer or a
qualified service technician if you use a fuel with the
specified octane rating and your vehicle knocks
heavily or persistently.
B Unleaded gasoline
The neck of the fuel filler pipe is designed to accept
only an unleaded gasoline filler nozzle. Under no
circumstances should leaded gasoline be used be-
cause it will damage the emission control system
and may impair driveability and fuel economy.
B Gasoline for California-certified LEV
Your vehicle was certified to California’s low emis-
sion vehicle (LEV) standards as indicated on the
underhood tune-up label. It is designed to optimize
engine and emission performance with gasoline that
meets the clean burning low-sulfur California gaso-
line specifications. If you live in any other state than
California, your vehicle will operate on gasoline