Subaru 2007 Tribeca - Manual (Page 231)

7-2
Starting and operating
Starting and operating Fuel
„ Fuel requirements
The engine is designed to operate using
unleaded gasoline with an octane rating of
91 AKI or higher. Regular unleaded gaso-
line with an octane rating of 87 AKI or
higher may be used. However for opti-
mum engine performance and driveability,
it is recommended that you use 91 AKI or
higher grade unleaded gasoline. You may
experience reduced output, poor acceler-
ator response, and reduced fuel economy
when using gasoline with an octane rating
lower than 91 AKI, depending on your
driving habits and conditions. If you expe-
rience any of these conditions while using
a lower octane rated fuel, you may want to
return to using 91 AKI octane rated fuel as
soon as possible. Additionally, if your ve-
hicle knocks heavily or persistently, or if
you are driving with heavy loads such as
when towing a trailer, the use of 91 AKI or
higher grade unleaded gasoline is re-
quired.
T Fuel octane rating
This octane rating is the average of the
Research Octane and Motor Octane num-
bers and is commonly referred to as the
Anti Knock Index (AKI).
Using a gasoline with a lower octane rat-
ing 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 circumstances 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 label, it is designed to
optimize engine and emission control sys-
tem performance with gasoline that meets
the clean burning low-sulfur California
gasoline specifications. If you live in any
other state than California, your vehicle
will operate on gasoline meeting Federal
specifications. Gasoline sold outside Cali-
fornia is permitted to have higher sulfur
levels, which may affect the performance
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. The CHECK ENGINE warning
light/Malfunction indicator lamp may also
turn on. If this occurs, return to your autho-
rized SUBARU dealer for diagnosis. If it is
determined that the condition is caused by
the type of fuel used, repairs may not be
covered by your warranty.
T MMT
Some gasoline contains an octane-en-
hancing additive called MMT (Methylcy-
clopentadienyl Manganese Tricarbonyl). If
you use such fuels, your emission control
system performance may deteriorate and
the CHECK ENGINE warning light/Mal-
function indicator lamp may turn on. If this
happens, return to your authorized SUBA-
RU Dealer for service. If it is determined
that the condition is caused by the type of
fuel used, repairs may not be covered by
Use of a fuel which is low in quality
or use of an inappropriate fuel addi-
tive may cause engine damage.
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