oil SUBARU IMPREZA WRX 2004 2.G Service Manual

11 - 3 4
Maintenance and service
SAE viscosity No. and Applicable Temperature
Rear differential gear oil !
Checking the gear oil level
Your vehicle may be equipped with a rear differential
protector. The differential protector provides protec-
tion to the rear differential assembly during off-road
use. Removal of the rear differential protector is not re-
quired when checking the oil level.
1) Filler plug
2) Drain plug
-30
-20 20 40 60 90
85W
80W
80W/90 80 100
0
-20 -10 10 20 30 40
0
HSB041AA
2 1HSB042BB

11 -3 5
Maintenance and service
– CONTINUED –
1) Filler hole
2) Drain hole
3) Oil level
Remove the plug from the filler hole and check the oil
level. The oil level should be kept even with the bottom
of the filler hole. If the oil level is below the bottom
edge of the hole, add oil through the filler hole to raisethe level.
If the vehicle requires frequent refilling, there
may be an oil leak. If you suspect a problem,
have the vehicle checked at your SUBARU deal-
er.
! Recommended grade and viscosity
Each oil manufacturer has its own base oils and addi-
tives. Never use different brands together.
Oil grade:
API classification GL-5
SAE viscosity No. and Applicable Temperature
3 1
2
HSB043BB-30 -20 -10 0 10 20 30 40-20 0 60 20
80W
75W/90 80 100
40
85W 90
HSB036BA

11 - 3 6
Maintenance and service
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 dif-
ferent checking ranges for hot and cold fluids.
Check the power steering fluid level monthly.
1. Park the vehicle on a level surface, and stop the en-
gine. 1) Specified range
2. Check the fluid level of the reservoir tank.
When the fluid is hot after the vehicle has been run:
Check that the oil level is between “HOT MIN” and
“HOT MAX” on the surface of the reservoir tank.
When the fluid is cool before the vehicle is run: Check
that the oil level is between “COLD MIN” and “COLD
MAX” on the surface of the reservoir tank.
3. If the fluid level is lower than the applicable “MIN”
line, add the recommended fluid as necessary to bring
the level between the “MIN” and “MAX” line.
If the fluid level is extreme low, it may indicate possible
leakage. Consult your SUBARU dealer for inspection.
HGB058BB1
1 1
HSB045BB

11 -5 3
Maintenance and service
– CONTINUED –
Aluminum wheels (If equipped)
Aluminum wheels can be scratched and damaged
easily. Handle them carefully to maintain their appear-
ance, performance, and safety. "When any of the wheels is removed and replaced
for tire rotation or to change a flat, always check the
tightness of the wheel nuts after driving approximately
600 miles (1,000 km). If any nut is loose, tighten it to
the specified torque. " Never apply oil to the threaded parts, wheel nuts, or
tapered surface of the wheel. " Never let the wheel rub against sharp protrusions or
curbs." Be sure to fit tire chains on uniformly and completely
around the tire, otherwise the chains may scratch the
wheel. " When wheel nuts, balance weights, or the center
cap is replaced, be sure to replace them with genuine
SUBARU parts designed for aluminum wheels.Intercooler water spray
Add water to the intercooler water spray tank when the
intercooler water spray warning light in the combina-
tion meter comes on. The warning light comes on
when the water in the tank has decreased to approxi-
mately 0.4 liters (0.4 US qt, 0.4 Imp qt).
UGB079BA

11 -6 5
Maintenance and service
– CONTINUED –
Wattage Bulb No.
1) Front turn signal 12V–21W —
2) Spot light 12V–8W —
3) Room light 12V–8W —
4) Parking light 12V–5W 168
5) Low beam head light U.S. spec. WRX-STi 12V-35W D2R Except U.S. spec. WRX-STi 12V-55W H1
6) Front fog light 12V–55W H3
7) High beam head light 12V–60W 9005 (HB3)
8) Trunk room light 12V–16W W16W
9) High mount stop light Sedan
(in compartment) 12V–18W 921
(in rear spoiler) 12V–1.2W —
Wagon 12V–13W 912
10) Backup light 12V–21W 7440
11) Rear turn signal 12V–21W (Amber)—
12) Brake light 12V–21W 7440
13) Tail light 12V–21/5W 7443
14) Brake/tail light 12V–21/5W 7443
15) License plate light 12V–5W 168 16) Cargo area light 12V–13W —
Wattage Bulb No.

12-4
Specifications !
Capacities
AT: Automatic transmission
MT: Manual transmission
Fuel tank15.9 US gal (60 liters, 13.2 Imp gal)
Engine oil2.5-liter engine model4.2 US qt (4.0 liters, 3.5 Imp qt)
2.0-liter turbo engine model4.8 US qt (4.5 liters, 4.0 Imp qt)
2.5-liter turbo engine model
Transmission oil (MT)5 speed3.7 US qt (3.5 liters, 3.1 Imp qt)
6 speed4.3 US qt (4.1 liters, 3.6 Imp qt)
Transmission oil (AT)10.0 US qt (9.5 liters, 8.4 Imp qt)
Power steering gear fluid0.7 US qt (0.7 liter, 0.6 Imp qt)
Engine coolant2.5-liter engine modelMT7.4 US qt (7.0 liters, 6.2 Imp qt)
AT7.3 US qt (6.9 liters, 6.1 Imp qt)
2.0-liter turbo engine modelMT8.1 US qt (7.7 liters, 6.8 Imp qt)
AT8.0 US qt (7.6 liters, 6.7 Imp qt)
2.5-liter turbo engine modelMT8.1 US qt (7.7 liters, 6.8 Imp qt)

12-9
Specifications
– CONTINUED –
Bulb chart
Description Wattage Bulb type
Headlight
U.S. spec. WRX-
STi versionLow beam 12V-35W D2R
High beam 12V-60W 9005 (HB3)
Except U.S. spec. WRX-STi version Low beam 12V-55W H1
High beam 12V-60W 9005 (HB3)
Front fog light 12V-55W H3
Front turn signal 12V-21W —
Parking light 12V-5W 168
Rear combination
light Brake light (sedan) 12V-21W 7440
Brake/tail light 12V-21/5W 7443
Turn signal light 12V-21W (Amber) —
Tail light (sedan) 12V-21/5W 7443
Back-up light 12V-21W 7440 High mount stop light
Sedan
(in compartment) 12V-18W 921
Sedan
(in rear spoiler) 12V-1.2W —
Wagon 12V-13W 912
License plate light 12V-5W 168
Trunk room light 12V-16W W16W
Cargo area light 12V-13W —
Front ashtray light 12V-1.4W —
Dome light 12V-8W —
Map light 12V-8W —
Description Wattage Bulb type

14-2
Index
A
ABS (Anti-lock Brake System)
...............................7-30
Warning light ................................................. 3-23, 7-31
Accessories ......................................................... 5-3, 11-63
Accessory power outlet ...................................6-9, 6-11
Active head restraint .................................................. 1-6
Air cleaner element ..................................................... 11-23
Air conditioner operation ..........................................4-9
Air filtration system ..................................................... 4-20
Air flow selection .......................................................... 4-2
Aluminum wheels ........................................................ 11-53
Ambient temperature gauge .........................3-11, 3-18
Antenna system ........................................................... 5-2
Anti-lock Brake System (ABS) ...............................7-30
Arming the system ...................................................... 2-15
Armrest ............................................................................ 1-9
Ashtray ............................................................................. 6-12
AT OIL TEMPerature warning light ......................3-22
Audio set ......................................................................... 5-3
Auto-dimming mirror /compass .............................3-44
Automatic/Emergency Locking Retractor (A/ELR) ....................................................................... 1-15
Automatic transmission ............................................. 7-21
Capacities ................................................................. 12-4
Fluid ............................................................................ 11-31
Selector lever .......................................................... 7-22
Shift lock release ................................................... 7-26Temperature warning light
.................................3-22
BBattery ............................................................................... 11-58
Jump starting ........................................................... 9-14
Replacement (Remote keyless entry system) .................................................................... 2-9
Brake Booster ....................................................................... 11-40
Fluid ............................................................................. 11-37
Pad and lining .......................................................... 11-42
Pedal ........................................................................... 11-40
Brake system ................................................................. 7-29
Warning light ............................................................ 3-24
Braking .............................................................................. 7-28
Breaking-in of new brake pads and linings .11-43
Tips .............................................................................. 7-28
Brake pedal
Free play .................................................................... 11-40
Reserve distance ................................................... 11-41
Bulb
Chart ............................................................................ 12-9
Replacing ................................................................... 11-64
C
Capacities ........................................................................ 12-4

14-3
Index
Cargo
Area cover ................................................................ 6-15
Area light ......................................................... 6-2, 11-77
Tie-down hooks ...................................................... 6-17
Catalytic converter ...................................................... 8-4
Center Console ..................................................................... 6-6
Ventilators ................................................................. 4-3
Visor ............................................................................ 6-4
Changing
Flat tire ....................................................................... 9-5
Oil and oil filter ........................................................ 11-12
Charge warning light .................................................. 3-21
CHECK ENGINE warning light/ Malfunction indicator lamp ..................................3-20
Checking
Brake pedal free play ........................................... 11-40
Brake pedal reserve distance ...........................11-41
Clutch function ........................................................ 11-41
Clutch pedal free play .......................................... 11-42
Engine oil level ....................................................... 11-11
Fluid level ....................... 11-31, 11-36, 11-37, 11-38
Gear oil level ................................ 11-28, 11-33, 11-34
Child restraint systems ............................................... 1-31
Installation with seatbelt .....................................1-35
Lower and tether anchorages ..........................1-42
Child safety .................................................................... 6Locks
.......................................................................... 2-21
Chime
Key .............................................................................. 3-4
Seatbelt ........................................................... 1-15, 3-19
Cigarette lighter socket ............................................. 6-10
Cleaning Aluminum wheels .................................................. 10-3
Interior ........................................................................ 10-6
Ventilator grille ........................................................ 4-19
Climate control system
Manual ....................................................................... 4-4
Semi-automatic ...................................................... 4-11
Clock ................................................................................. 3-28
Clutch fluid ...................................................................... 11-38
Clutch pedal ................................................................... 11-41
Coat hook ....................................................................... 6-14
Coin tray .......................................................................... 6-7
Cooling system ............................................................. 11-18
Corrosion protection ......................................... 8-14, 10-4
Cruise control ................................................................ 7-37
Indicator light ........................................................... 3-26
Set indicator light ................................................... 3-26
Cup holder ...................................................................... 6-7
D
Daytime running light system .................................3-31
Differential gear oil

14-4
Index
Front
........................................................................... 11-33
Rear ............................................................................ 11-34
Dimensions .................................................................... 12-2
Disarming the system ................................................ 2-17
Disc brake pad wear warning indicators ............7-29
Dome light ............................................................ 6-2, 11-77
Door locks ....................................................................... 2-3
Door open warning lights .........................................3-25
Drive belts ....................................................................... 11-27
Driver’s control center differential ........................7-18
Auto indicator light ................................................ 3-26
Indicator light .......................................................... 3-27
Driving
Drinking ..................................................................... 8
Drugs .......................................................................... 9
Foreign countries .................................................. 8-6
Mobile phone .......................................................... 10
Pets ............................................................................. 10
Tips ........................................................... 7-14, 7-17, 8-7
Tired or sleepy ........................................................ 9
Snowy and icy roads ............................................ 8-13
E
EBD (Electronic brake force distribution) system ......................................................................... 7-32
Electrical system .......................................................... 12-3Electronic Brake force Distribution (EBD)
system .......................................................................... 7-32
Emergency Locking Retractor (ELR) ...................1-14
Engine Compartment overview ........................................11-8
Coolant ....................................................................... 11-19
Exhaust gas (Carbon monoxide) .....................8, 8-3
Hood ............................................................................ 11-5
Oil ................................................................................. 11-11
Overheating .............................................................. 9-16
Starting ....................................................................... 7-9
Stopping ..................................................................... 7-11
Exterior care ................................................................... 10-2
F
Flat tires ............................................................................ 9-5
Floor mat .......................................................................... 6-13
Fluid level
Automatic transmission .......................................11-31
Brake ........................................................................... 11-37
Clutch .......................................................................... 11-38
Power steering ........................................................ 11-36
Fog light switch ............................................................. 3-35
Folding down the rear seat .......................................1-12
Front Differential gear oil ................................................. 11-33
Fog light ..................................................................... 11-73