octane SUBARU OUTBACK 2004 4.G Owners Manual

7-2
Starting and operating
Starting and operatingFuel
Use of a fuel which is low in quality or use of an
inappropriate fuel additive may cause engine
damage.
„ Fuel requirements
T 2.5 Liter models
The 2.5 Liter engine is designed to operate using un-
leaded gasoline with an octane rating of 87 AKI or
higher. T 3.0 Liter models
The 3.0 Liter engine is designed to operate using pre-
mium unleaded gasoline with an octane rating of 91
AKI or higher. Regular unleaded gasoline with an oc-
tane rating of 87 AKI may be used if necessary. For
optimum engine performance and driveability, it is rec-
ommended that you use premium grade unleaded
gasoline. T Fuel octane rating
This octane rating is the average of the Research Oc- tane and Motor Octane numbers and is commonly re-
ferred 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 some-
times 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. T
Unleaded gasoline
The neck of the fuel filler pipe is designed to accept
only an unleaded gasoline filler nozzle. Under no cir-
cumstances should leaded gasoline be used because
it will damage the emission control system and may
impair driveability and fuel economy. T California fuel
If your vehicle was certified to California Emission
Standards as indicated on the underhood tune-up la-
bel. It is designed to optimize engine and emission
control system performance with gasoline that meets
the clean burning low-sulfur California gasoline speci-
fications. If you live in any other state than California,
your vehicle will operate on gasoline meeting Federal
specifications. Gasoline sold outside California is per-
mitted to have higher sulfur levels, which may affect
the performance of your vehicle’s catalytic converter

7-3
Starting and operating
– CONTINUED –
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 vehi-
cle to an authorized dealer for service. The CHECK
ENGINE warning light/Malfunction indicator lamp may
also turn on. If this occurs, return to your authorized
SUBARU dealer for diagnosis. If it is determined that
the condition is caused by the type of fuel used, re-
pairs may not be covered by your warranty. TMMT
Some gasoline contains an octane-enhancing additive
called MMT (Methylcyclopentadienyl Manganese Tri-
carbonyl). If you use such fuels, your emission control
system performance may deteriorate and the CHECK
ENGINE warning light/Malfunction indicator lamp may
turn on. If this happens, return to your authorized
SUBARU Dealer for service. If it is determined that the
condition is caused by the type of fuel used, repairs
may not be covered by your warranty. T Gasoline for cleaner air
Do not let fuel spill on the exterior surfaces of
the vehicle. Fuels containing alcohol may cause paint damage, which is not covered un-
der the SUBARU Limited Warranty.
Your use of gasoline with detergent additives will help
prevent deposits from forming in your engine and fuel
system. This helps keep your engine in tune and your
emission control system working properly, and is a
way of doing your part for cleaner air. If you continu-
ously use a high quality fuel with the proper detergent
and other additives, you should never need to add any
fuel system cleaning agents to your fuel tank.
Many gasolines are now blended with materials called
oxygenates. Use of these fuels can also help keep the
air cleaner. Oxygenated blend fuels, such as MTBE
(Methyl Tertiary Butyl ether) or ethanol (ethyl or grain
alcohol) may be used in your vehicle, but should con-
tain no more than 15% MTBE or 10% ethanol for the
proper operation of your SUBARU.
In addition, some gasoline suppliers are now produc-
ing reformulated gasolines, which are designed to re-
duce vehicle emissions. SUBARU approves the use of reformulated gasoline.
If you are not sure what the fuel contains, you should
ask your service station operators if their gasolines
contain detergents and oxygenates and if they have

7-4
Starting and operating
been reformulated to reduce vehicle emissions.
As additional guidance, only use fuels suited for your
vehicle as explained below. y
Fuel should be unleaded and have an octane rating
no lower than that specified in this manual. y Methanol (methyl or wood alcohol) is sometimes
mixed with unleaded gasoline. Methanol can be used
in your vehicle ONLY if it does not exceed 5% of the
fuel mixture AND if it is accompanied by sufficient
quantities of the proper cosolvents and corrosion in-
hibitors required to prevent damage to the fuel system.
Do not use fuel containing methanol EXCEPT under
these conditions.y If undesirable driveability problems are experienced
and you suspect they may be fuel related, try a differ-
ent brand of gasoline before seeking service at your
SUBARU dealer.y Fuel system damage or driveability problems which
result from the use of improper fuel are not covered
under the SUBARU Limited Warranty. „
Fuel filler lid and cap
T Refueling
0
Sedan
UBF013DA

GAS STATION REFERENCE
Fuel: T2.5 Liter models
Use only unleaded gasoline with an octane rating of
87 AKI or higher. T 3.0 Liter models
Use premium unleaded gasoline with an octane rat-
ing of 91 AKI or higher. Regular unleaded gasoline
with an octane rating of 87 AKI may be used if nec-
essary. For optimum engine performance and drive-
ability, it is recommended that you use premium
grade unleaded gasoline. „ Fuel octane rating
This octane rating is the average of the Research
Octane and Motor Octane numbers and is common-
ly referred to as the Anti Knock Index (AKI). Refer to “Fuel” section in this manual. Fuel capacity:
16.9 US gal (64 liters, 14.1 Imp gal) Engine oil:
Use only API classification SL with the words “EN-
ERGY CONSERVING” and the New API certifica-
tion mark (starburst mark) displayed on the contain-er. Engine oil capacity:
2.5 liter models: 4.2 US qt (4.0 liters, 3.5 Imp qt)
3.0 liter models: 5.6 US qt (5.3 liters, 4.6 Imp qt)
Cold tire pressure: Tire size P205/60R15 90H P205/55R16 89H P225/60R16 97H
Wheel size 15 x 6JJ 16 x 6 1
/2 JJ
Pressure Front 32 psi (220 kPa, 2.2 kg/cm 2
) 30 psi (210 kPa, 2.1 kg/cm 2
)
Rear 30 psi (210 kPa, 2.1 kg/cm 2
) 29 psi (200 kPa, 2.0 kg/cm 2
)
Rear at trailer towing – 32 psi (220 kPa, 2.2 kg/cm
2
)
Temporary
spare tire Size T135/70R16 T145/80R16
Pressure
60 psi (420 kPa, 4.2 kg/cm2
)