Subaru 2009 Impreza User Manual download pdf (Page 223)

Fuel

CAUTION

Use of a fuel which is low in quality

or use of an inappropriate fuel

additive may cause engine damage.

& Fuel requirements

! Non-turbo models

The engine is designed to operate using

unleaded gasoline with an octane rating of

87 AKI or higher.

! Turbo models

! Except WRX STI

The engine is designed to operate using

premium unleaded gasoline with an oc-

tane rating of 91 AKI or higher. If premium

unleaded gasoline is not available, regular

unleaded gasoline with an 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.

NOTE

Be sure to use premium unleaded

gasoline of 91 AKI or higher. If other

gasoline (lower than 91 AKI) is used,

knocking, reduced output and poor

accelerator response will result.

! WRX STI

The engine is designed to operate at

maximum performance using unleaded

gasoline with an octane rating of 93 AKI

or higher. If 93 AKI fuel is not readily

available in your area, unleaded gasoline

with an octane rating of 91 AKI may be

used with no detriment to engine durability

or driveability. However, you may notice a

slight decrease in maximum engine per-

formance while using 91 AKI fuel. Use of

91 AKI fuel will not affect your warranty

coverage.

! Fuel octane rating

This octane rating is the average of the

Research Octa ne and Motor Octane

numbers and is commonly 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.

! 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 because it will

damage the emission control system and

may impair driveability and fuel economy.

! Gasoline for California-certified

LEV

If your vehicle was certified to California’s

low emission 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 Cali-

fornia gasoline specifications. If you live in

any other state than Cali fornia, your

vehicle will operate on gasoline meeting

Federal specifications. Gasoline sold out-

side California is permitted to have higher

sulfur levels, which may affect the perfor-

mance of your vehicle’s catalytic converter

and may produce a sulfur exhaust odor or

smell. SUBARU recommends that you try

a different brand of unleaded gasoline

having lower sulfur to determine if the

problem is fuel related before returning

your vehicle to an authorized dealer for

service.

Starting and operating 7-3

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