Subaru 2008 IMPREZA - Manual (Page 304)

11-12
Maintenance and service
& Recommended grade and
viscosity under severe driv-
ing 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 SM (or SL):
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 radia-
tor 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 boil-
ing hot coolant when the cap is
removed.
CAUTION
. The cooling system has been
filled at the factory with a high
quality, corrosion-inhibiting,
year-around coolant which pro-
vides protection against freezing
down to
−338F (−368C).
Subaru engines use aluminum
components that require the
anti-corrosive and anti-freeze
properties of Subaru Genuine
Coolant, which is specifically
formulated for the Subaru cool-
ing system. Failure to use Subaru
Genuine Coolant along with
Subaru Cooling System Condi-
tioner at the recommended main-
tenance intervals may result in
problems, including, but not lim-
ited to shortened life of engine
components and cooling system
clogging, coolant leaks and en-
gine damage from overheating.
Problems caused by the failure to
use Subaru Genuine Coolant and
Subaru Cooling System Condi-
tioner at recommended intervals
are not covered under the
Subaru Limited Warranty.
While there may be other generic
products that may provide the
required protection, they have
not been tested for compatibility
with Subaru engines and cooling
system components, and there-
fore they are not recommended.
. 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 con-
nections
Your vehicle employs an electric cooling
fan which is thermostatically controlled to
operate when the engine coolant reaches
a specific temperature.