2003 SUBARU IMPREZA WRX oil temperature

Maintenance and service
11-14
New API Certification Mark (Starburst Mark)
In choosing an oil, you want the proper quality and
viscosity, as well as one that will add to fuel econo-
my. The following table lists the recommended vis-
cosities and applicable temperatures.
When adding oil, different brands may be used to-
gether as long as they are the same API classifica-
tion and SAE viscosity as those recommended bySUBARU.SAE viscosity number and applicable temperature
*) 5W-30 is preferred.
Engine oil viscosity (thickness) affects fuel economy.
Oils of lower viscosity provide better fuel economy.
However, in hot weather, oil of higher viscosity is re-
quired to properly lubricate the engine.
CAUTION
Use only engine oil with the recommended
grade and viscosity.

Maintenance and service
11-15
– CONTINUED –
Recommended grade and viscosity under severe driving conditions
If the vehicle is used in desert areas, in areas with
very high temperatures, or used for heavy-duty ap-
plications such as towing a trailer, use of oil with the
following grade and viscosities is recommended.
API classification SL or SJ: 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 inthis 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 underpressure, you may suffer serious burns from a
spray of boiling hot coolant when the cap isremoved.
CAUTION

The cooling system has been filled at the
factory with a high quality, corrosion-inhibit-
ing, year-around coolant which provides protection against freezing down to –33°F
(–36 °C). For adding, use genuine SUBARU
coolant or an equivalent: a mixture of 50%
soft water and 50% ethylene-glycol basis cool-
ant. Use of improper coolants may result in
corrosion in the cooling system. It is impor- tant to maintain protection against freezing and corrosion, even if freezing temperaturesare not expected. Never mix different kinds ofcoolant.

Maintenance and service
11-30
1) Upper level 2) Lower level
3. Pull out the dipstick again and check the oil level on it. If it is below the lower level, add oil to bring thelevel up to the upper level. Recommended grade and viscosity
Each oil manufacturer has its own base oils and ad-
ditives. Never use different brands together.
Oil grade: API classification GL-5SAE viscosity No. and Applicable Temperature

Maintenance and service
11-32
Recommended grade and viscosity
Each oil manufacturer has its own base oils and ad-
ditives. Never use different brands together.
Oil grade: API classification GL-5
SAE viscosity No. and Applicable Temperature Power steering fluid
Checking the fluid level
1) Reservoir tank
The power steering fluid expands greatly as its tem-
perature rises; the fluid level differs according to
fluid temperature. Therefore, the reservoir tank has
two different checking ranges for hot and coldfluids.
Check the power steering fluid level monthly.
1. Park the vehicle on a level surface, and stop theengine.

Index
14-2
A
ABS (Anti-lock Brake System) 7-23. . . . . . . . . . . . . . . . .
Warning light 3-13, 7-24 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessory power outlet 6-8, 6-11 . . . . . . . . . . . . . . . . .
Accessories 5-2, 11-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air cleaner element 11-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air conditioner operation 4-9 . . . . . . . . . . . . . . . . . . . . . .
Air filtration system 4-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air flow selection 4-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Aluminum wheels 11-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ambient temperature indicator 3-9 . . . . . . . . . . . . . . . .
Antenna system 5-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Anti-lock Brake System (ABS) 7-23 . . . . . . . . . . . . . . . .
Arming the system 2-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Armrest 1-9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ashtray 6-12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AT OIL TEMPerature warning light 3-13 . . . . . . . . . . . .
Audio set 5-3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Auto-dimming mirror /compass 3-27 . . . . . . . . . . . . . . . .
Automatic/Emergency Locking Retractor
(A/ELR) 1-14
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic transmission 7-14 . . . . . . . . . . . . . . . . . . . . . . . .
Capacities 12-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid 11-27
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Selector lever 7-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shift lock release 7-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature warning light 3-13 . . . . . . . . . . . . . . . . . . B
Battery
11-54
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Jump starting 9-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacement (Remote keyless entry system) 2-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake
Booster 11-36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid 11-34
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pad and lining 11-39 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pedal 11-37
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake system 7-22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warning light 3-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Braking 7-22
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tips 7-22
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Breaking-in of new brake pads and linings 11-40
Brake pedal
Free play 11-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reserve distance 11-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bulb Chart 12-9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing 11-61 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CCapacities 12-4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cargo Anchorage hooks 6-16 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Area light 6-2, 11-73 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Index
14-9
AT OIL TEMPerature 3-13. . . . . . . . . . . . . . . . . . . . . . . .
Brake system 3-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charge 3-12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CHECK ENGINE 3-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door open 3-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front-wheel drive 3-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil pressure 3-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Seatbelt 3-10
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SRS airbag system 3-11 . . . . . . . . . . . . . . . . . . . . . . . . . .
Warranties and maintenance 8-27 . . . . . . . . . . . . . . . . . .
Washing 10-2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Waxing and polishing 10-3 . . . . . . . . . . . . . . . . . . . . . . . . . .
Wear indicators 11-45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wheel Alignment 12-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Balance 11-45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Covers 11-49 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacement 11-48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windows 2-22
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windshield washer fluid 11-50 . . . . . . . . . . . . . . . . . . . . . . . .
Windshield wiper and washer switches 3-24 . . . . . . .
Winter driving 8-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiper and washer 3-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .