Fuel; Fuel Requirements - Subaru 2012 Forester Owner's Manual

7-2
Starting and operating

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 (90 RON) or higher.
! Turbo models
The engine is designed to operate using
premium unleaded gasoline with an
octane rating of 91 AKI (95 RON) or
higher. If premium unleaded gasoline is
not available, regular unleaded gasoline
with an octane rating of 87 AKI (90 RON)
or higher may be temporarily used. For
optimum engine performance and drive-
ability, it is required that you use premium
grade unleaded gasoline.
NOTE
Be sure to use premium unleaded
gasoline of 91 AKI (95 RON) or higher
for turbo engine models. If other gaso-
line (lower than 91 AKI (95 RON)) is
used, knocking, reduced output and
poor acceleration will result.
! Fuel octane rating
This octane rating is the average of the
Research Octane 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.
It is normal if your vehicle sometimes
knocks lightly when you drive up a hill or
when you accelerate, but contact your
SUBARU dealer if your vehicle knocks
heavily or persistently even though you
are using a fuel with the specified octane
rating.
! 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. Gasoline
sold outside California is permitted to
have higher sulfur levels. It can be used
but it 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 hav-
ing lower sulfur to determine if the problem
is fuel related before returning your
vehicle to an authorized SUBARU dealer
for service.
! 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 light may turn on. If this
happens, contact an 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.