Subaru WRX & WRX STI Manuals 2011 Impreza WRX & WRX STI Owner's Manual | Page 366

11-14

Maintenance and service

CAUTION
Use only engine oil with the recommended grade and viscosity.

& Recommended grade and
viscosity under severe driving conditions
If the vehicle is used in desert areas, in
areas with very high temperatures, or is
used for heavy-duty applications, use of
oil with the following grade and viscosities
is recommended.
API classification SN (or SM):
SAE viscosity No.: 30, 40, 10W-50,
20W-40, 20W-50

& Synthetic oil
You can use synthetic engine oil that
meets the same requirements given for
conventional engine oil. When using
synthetic oil, you must use oil of the same
classification, viscosity and grade shown
in this Owner’s Manual, and must follow
the oil and filter changing intervals shown
in the maintenance schedule.

Cooling system
WARNING
Never attempt to remove the radiator cap until the engine has been
shut off and has cooled down
completely. Since the coolant is
under pressure, you may suffer
serious burns from a spray of boiling hot coolant when the cap is
removed.

CAUTION
. Vehicles are filled at the factory
with SUBARU Super Coolant that
does not require the first change
for 11 years/137,500 miles (11
years/220,000 km). This coolant
should not be mixed with any
other brand or type of coolant
during this period. Mixing with a
different coolant will reduce the
life of the coolant. Should it be
necessary to top up the coolant
for any reason, use only
SUBARU Super Coolant.
If the SUBARU Super Coolant is
diluted with another brand or
type, the maintenance interval is

shortened to that of the mixing
coolant.
. Do not splash the engine coolant
over painted parts. The alcohol
contained in the engine coolant
may damage the paint surface.

& Cooling fan, hose and connections
Your vehicle employs an electric cooling
fan which is thermostatically controlled to
operate when the engine coolant reaches
a specific temperature.
If the radiator cooling fan does not operate
even when the following condition occurs,
the cooling fan circuit may be defective.
. For turbo models, the engine coolant
temperature gauge exceeds the normal
operating range. Refer to “Temperature
gauge (turbo models)” F3-11.
. For non-turbo models, the coolant
temperature high warning light blinks or
illuminates in RED. Refer to “Coolant
temperature low indicator light (non-turbo
models)/Coolant temperature high warning light (non-turbo models)” F3-17.
Check the fuse and replace it if necessary.
Refer to “Fuses” F11-46 and “Fuse panel
located in the engine compartment” F128.