2005 SUBARU IMPREZA ECO mode

7-2
Starting and operating
Starting and operatingFuel
Use of a fuel which is low in quality or use of an
inappropriate fuel additive may cause engine
damage.
„ Fuel requirements
T 2.5-liter non-turbo models
The 2.5-liter non-turbo engine is designed to operate
using unleaded gasoline with an octane rating of 87
AKI or higher. T 2.0-liter turbo models
The 2.0-liter turbo engine is designed to operate using
premium unleaded gasoline with an octane rating of
91 AKI or higher. If premium unleaded gasoline is not
available, regular unleaded gasoline with an octane
rating of 87 AKI or higher may be temporarily used.
For optimum engine performance and driveability, it is
required that you use premium grade unleaded gaso-
line. T
2.5-liter turbo model
The 2.5-liter turbo engine is designed to operate using
super-premium unleaded gasoline with an octane rat-
ing of 93 AKI or higher. If super-premium unleaded
gasoline with an octane rating of 93 AKI or higher is
not available, premium unleaded gasoline with an oc-
tane rating of 91 AKI or higher can be used. For opti-
mum engine performance and driveability, it is recom-
mended that you use super-premium grade unleaded
gasoline with an octane rating of 93 AKI or higher. T Fuel octane rating
This octane rating is the average of the Research Oc-
tane and Motor Octane numbers and is commonly re-
ferred 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. Do not be concerned if your vehicle some-
times knocks lightly when you drive up a hill or when
you accelerate. See your dealer or a qualified service
technician if you use a fuel with the specified octane
rating and your vehicle knocks heavily or persistently. T Unleaded gasoline
The neck of the fuel filler pipe is designed to accept
only an unleaded gasoline filler nozzle. Under no cir-
cumstances should leaded gasoline be used because
it will damage the emission control system and may

7-16
Starting and operating
T
Maximum allowable speeds
The following table shows the maximum speeds that
are possible with each different gear.
Never exceed the speed limit below for each gear po-
sition except for brief acceleration in an emergency.
The tachometer’s needle (if so equipped) will enter the
red area if these speeds are exceeded. Failure to ob-
serve this precaution can lead to excessive engine
wear and poor fuel economy. 2.5-liter non-turbo models
mph (km/h)
2.0-liter turbo models mph (km/h)
When shifting down a gear, ensure that the ve-
hicle is not travelling at a speed exceeding the
Maximum Allowable Speed for the gear which
is about to be selected. Failure to observe this
precaution can lead to engine over-revving and
this in turn can result in engine damage.
Shift up mph (km/h)
1st to 2nd 15 (24)
2nd to 3rd 25 (40)
3rd to 4th 40 (65)4th to 5th 45 (73)
RS sport package RS, OUTBACK
1st 29 (46) 28 (45)
2nd 48 (77) 47 (75)
3rd 68 (110) 66 (106)
WRX
1st 35 (56)
2nd 61 (98) 3rd 87 (140)

7-22
Starting and operating
Automatic transmission
The automatic transmission is electronically controlled
with 4-forward speeds and 1-reverse speed.
NOTE
Immediately after a disconnected battery is recon-
nected (Turbo model only) or ATF (automatic
transmission fluid) is replaced, you may feel that
the automatic transmission operation is some-
what unusual.
This results from erasure or invalidation of data
the on-board computer has collected and stored in memory to allow the transmission to shift at the
most appropriate times for the current condition
of your vehicle. Optimized shifting will be restored
as the vehicle continues to be driven for a while.
Do not shift from the “P” or “N” position into
the “D”, “3”, “2”, “1” or “R” position while de-
pressing the accelerator pedal. This may cause
the vehicle to jump forward or backward.
y
Shift into the “P” or “R” position only after
the vehicle is completely stopped. Shifting
while the vehicle is moving may cause damage
to the transmission.y Do not race the engine for more than five sec-
onds in any position except the “N” or “P” po-
sition when the brake is set or the tires are on
blocks. This may cause the automatic transmis-
sion fluid to overheat. y Avoid shifting from one of the forward driving
positions into the “R” position or vice versa un-
til the vehicle has completely stopped. Such
shifting may cause damage to the transmis-
sion.

8-1
8
Driving tips
New vehicle break-in driving – the first 1,000 miles (1,600 km) ................ 8-2
Fuel economy hints ...................................... 8-2
Engine exhaust gas (Carbon monoxide) .... 8-3
Catalytic converter ....................................... 8-4
Periodic inspections .................................... 8-6
Driving in foreign countries ......................... 8-6
Driving tips for AWD vehicles ..................... 8-7
Off road driving ............................................ 8-8 All AWD models except OUTBACK SPORT and vehicles with 17 inch tires ..................... 8-9
OUTBACK SPORT ............................................. 8-9
Winter driving ............................................... 8-11 Operation during cold weather ........................ 8-11
Driving on snowy and icy roads ...................... 8-13
Corrosion protection ........................................ 8-14
Snow tires .......................................................... 8-14
Tire chains ......................................................... 8-16
Rocking the vehicle .......................................... 8-16
Loading your vehicle ................................... 8-17 Vehicle capacity weight .................................... 8-19
GVWR and GAWR (Gross Vehicle Weight Rating and Gross Axle Weight Rating) ........ 8-19
Roof rail and crossbar (if equipped) ............... 8-20
Trailer hitch (if equipped) ............................ 8-25 Connecting a trailer .......................................... 8-25
When you do not tow a trailer .......................... 8-28
Trailer towing ................................................ 8-29 Warranties and maintenance ........................... 8-29 Maximum load limits ........................................ 8-29
Trailer hitches ................................................... 8-34
Connecting a trailer .......................................... 8-35
Trailer towing tips ............................................. 8-37

8-14
Driving tips
T
Wiper operation when snowing
Before driving in cold weather, make sure the wiper
blades are not frozen to the windshield or rear window.
If the wiper blades are frozen to the windshield or rear
window, use the defroster with the airflow control dial
in the “ ” position and the temperature control dial
set for maximum warmth until the wiper blades are
completely thawed out. If your vehicle is equipped with
a wiper deicer, it is helpful to thaw the windshield wiper
blades. To thaw out the rear wiper blade, use the rear
window defogger.
When driving in snow, if frozen snow starts to stick on
the surface of the windshield despite wiper operation,
use the defroster with the airflow control dial in “ ”
and the temperature control dial set for maximum
warmth. After the windshield gets warmed enough to
melt the frozen snow on it, wash it away using the
windshield washer.
Snow stuck on the wiper arm prevents the wiper from
working effectively. If snow is stuck on the wiper arm,
pull off the road to a safe place, then remove it. If you
stop the vehicle at road side, use the hazard warning
flasher to alert other drivers.
We recommend use of non-freezing type wiper blades
(winter blades) during the seasons you could have snow and sub-zero temperatures. Blades of this type
give superior wiping performance in snowy conditions.
Be sure to use blades that are suitable for your vehi- cle. „
Corrosion protection
Refer to the “Corrosion protection” section (chapter
10). „ Snow tires
T All models except WRX-STi
yWhen replacing original tires with winter
(snow) tires, make sure you use only the same
size, construction and load range as the origi-
nal tires listed on the tire placard. Using other
sizes and construction may affect speedome-
ter/odometer calibration and clearance be-
tween the body and tires. It also may be danger-
ous and lead to loss of vehicle control.y You must install four winter tires that are of
the same size, construction, brand, and load
range. Mixing other sizes or constructions may
result in severe mechanical damage to the drive

11 - 1
11
Maintenance and service
Maintenance schedule ................................. 11-3
Maintenance precautions ............................ 11-3 Before checking or servicing in the engine compartment .................................................. 11-4
When you do checking or servicing in the engine compartment while the engine is
running ............................................................ 11-5
Engine hood .................................................. 11-5
Engine compartment overview ................... 11-8 2.5-liter non-turbo models ................................ 11-8
2.0-liter turbo models ....................................... 11-9
2.5-liter turbo models ....................................... 11-10
Engine oil ...................................................... 11-11 Checking the oil level ....................................... 11-11
Changing the oil and oil filter .......................... 11-12
Recommended grade and viscosity ................ 11-16
Recommended grade and viscosity under severe driving conditions .............................. 11-18
Synthetic oil ....................................................... 11-18
Cooling system ............................................. 11-18 Cooling fan, hose and connections ................ 11-19
Engine coolant .................................................. 11-19
Air cleaner element ...................................... 11-24 Replacing the air cleaner element ................... 11-24
Spark plugs ................................................... 11-28 Recommended spark plugs ............................. 11-28
Drive belts ..................................................... 11-29
Manual transmission oil ............................... 11-30 Checking the oil level ....................................... 11-30
Recommended grade and viscosity ................ 11-31 Automatic transmission fluid ...................... 11-32
Checking the fluid level .................................... 11-32
Recommended fluid ......................................... 11-34
Front differential gear oil (AT vehicles) ...... 11-35 Checking the oil level ....................................... 11-35
Recommended grade and viscosity ............... 11-35
Rear differential gear oil ............................... 11-36 Checking the gear oil level .............................. 11-36
Recommended grade and viscosity ............... 11-37
Power steering fluid ...................................... 11-38 Checking the fluid level .................................... 11-38
Recommended fluid ......................................... 11-39
Brake fluid ..................................................... 11-40 Checking the fluid level .................................... 11-40
Recommended brake fluid ............................... 11-40
Clutch fluid (MT vehicles) ............................ 11-41 Checking the fluid level .................................... 11-41
Recommended clutch fluid .............................. 11-42
Brake booster ................................................ 11-42
Brake pedal .................................................... 11-43 Checking the brake pedal free play ................ 11-43
Checking the brake pedal reserve distance ... 11-43
Clutch pedal (MT vehicles) ........................... 11-44 Checking the clutch function .......................... 11-44
Checking the clutch pedal free play ............... 11-44
Replacement of brake pad and lining ......... 11-45 Breaking-in of new brake pads and linings .... 11-45
Parking brake stroke .................................... 11-46
Tires and wheels ........................................... 11-47

11 - 6
Maintenance and service
3. Release the secondary hood release located under
the front grille by moving the lever toward the left.
Lift up the hood, release the hood prop from its retain-
er and put the end of the hood prop into the slot in the
hood.
To close the hood:
All models except WRX and WRX-STi:
1. Lift the hood slightly and remove the hood prop
from the slot in the hood and return the prop to its re-
tainer.
2. Lower the hood until it approaches about
5.9 in (15
cm) from the closed position and let it drop.
WRX and WRX-STi:
1. Lift the hood slightly and remove the hood prop
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11 - 1 2
Maintenance and service
2.5-liter non-turbo and 2.0-liter turbo models
1) Notch
2) Upper level
3) Lower level
4. Pull out the dipstick again and check the oil level on
it. If it is below the lower level, add oil to bring the level
up to the upper level.
y Use only engine oil with the recommended
grade and viscosity. y Be careful not to spill engine oil when adding
it. If oil touches the exhaust pipe, it may cause
a bad smell, smoke, and/or a fire.
If you check the oil level just after stopping the engine,
wait a few minutes for the oil to drain back into the oil
pan before checking the level.
Just after driving or while the engine is warm, the en-
gine oil level reading may be in a range between the
upper level and the notch mark. This is caused by ther-
mal expansion of the engine oil.
To prevent overfilling the engine oil, do not add any
additional oil above the upper level when the engine is cold. „ Changing the oil and oil filter
Change the oil and oil filter according to the mainte-
nance schedule in the “Warranty and Maintenance Booklet”.
The engine oil and oil filter must be changed more fre-
quently than listed in the maintenance schedule when
driving on dusty roads, when short trips are frequently
made, or when driving in extremely cold whether.
1. Warm up the engine by letting the engine idle for
about 10 minutes to ease draining the engine oil.
2. Park the vehicle on a level surface and stop the en-
gine.
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