Page 166 of 240
4.6L 4V V8 (Mach 1) engine
1. Engine oil filler cap
2. Brake fluid reservoir
3. Engine oil dipstick
4. Power distribution box
5. Windshield washer fluid reservoir
6. Battery
7. Engine coolant reservoir
8. Power steering fluid reservoir
9. Air filter assembly
10. Automatic transmission fluid dipstick (if
equipped)
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Maintenance and Specifications
166
Page 194 of 240

If the vehicle’s powertrain system or its battery has
just been serviced, the on-board diagnostics system
is reset to a“not ready for I/M test”condition. To
ready the on-board diagnostics system for I/M
testing, a minimum of 30 minutes of city and
highway driving is necessary as described below:
•First, at least 10 minutes of driving on an
expressway or highway.
•Next, at least 20 minutes driving in stop-and-go,
city-type traffic with at least four idle periods.
Allow the vehicle to sit for at least eight hours
without starting the engine. Then, start the engine
and complete the above driving cycle. The engine
must warm up to its normal operating temperature.
Once started, do not turn off the engine until the
above driving cycle is complete.
CHECKING AND ADDING POWER STEERING
FLUID
Check the power steering fluid. Refer to the
scheduled maintenance guide for the service interval
schedules. If adding fluid is necessary, use only
MERCONAT F.
If your vehicle is
equipped with the
OHV V6 engine,
check the power
steering fluid level with
the engine at normal
operating temperature.
1. Start the engine and
let it run until it
reaches normal
operating temperature
(the engine coolant
temperature gauge
indicator will be near
the center of the
normal area between H
and C).
FILL
HOT
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Maintenance and Specifications
194
Page 195 of 240

2. While the engine idles, turn the steering wheel
left and right several times.
3. Turn the engine off.
4. Check the fluid level on the dipstick. It should be
within the FULL HOT range. Do not add fluid if the
level is within this range.
5. If the fluid is low, add fluid in small amounts,
continuously checking the level until it reaches the
correct operating range. Be sure to put the cap back
on the reservoir.
If your vehicle is
equipped with a 4.6L
V8 engine,check the
power steering fluid
level with the engine at
ambient temperature.
Allow at least one-half
hour after driving for
the power steering
fluid to cool.
1. Start the engine and
allow the engine to
idle.
2. Turn the steering
wheel left and right
several times.
3. Turn the engine off.
4. Check the fluid level in the reservoir. It should be
between the MIN and MAX lines. Do not add fluid if
the level is within this range.
5. If the fluid is low, add fluid in small amounts,
continuously checking the level until it reaches the
correct operating range. Be sure to put the cap back
on the reservoir.
MAXMIN
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Maintenance and Specifications
195
Page 216 of 240
Fluid Ford Part
NameApplication Capacity
Engine
coolant
1Motorcraft
Premium
Gold Engine
Coolant
(yellow-
colored)OHV V6
engine11.2L
(11.8 quarts)
4.6L SOHC
V8 engine13.3L
(14.1 quarts)
4.6L 4v V8
(Mach 1)
with
Automatic
Transmission15.2L
(16.1 quarts)
4.6L 4v V8
(Mach 1)
with Manual
Transmission15.2L
(16.1 quarts)
Power
steering fluidMotorcraft
MERCON
AT FOHV V6
engineKeep in
FULL HOT
range on
dipstick
4.6L SOHC
V8/4.6L 4v V8
(Mach 1)
engineFill to
between MIN
and MAX
lines on
reservoir
Rear axle
lubricant
2Motorcraft
SAE 80W-90
Premium
Rear Axle
Lubricant7 .5 inch axle 1.5L
(3.25 pints)
Motorcraft
SAE 75W-140
Synthetic
Rear Axle
Lubricant8.8 inch axle 2.0L
(4.25 pints)
Fuel tank N/A All 59.4L
(15.7 gallons)
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Maintenance and Specifications
216
Page 219 of 240
Item Ford part
nameFord part
numberFord
specification
Engine oil Motorcraft
SAE 5W-20
Super
Premium
Motor Oil
(US)
Motorcraft
SAE 5W-20
Super
Premium
Motor Oil
(Canada)XO-5W20-QSP
(US)
CXO-5W20
–LSP12
(Canada)
WSS-M2C153-H
with API
Certification
Mark
Lock
cylindersPenetrating
and Lock
LubricantMotorcraft
XL-1none
Power
steering fluid
and
convertible
top fluid (if
equipped)Motorcraft
MERCON
AT FXT-2-QMMERCON
Rear Axle
LubricantMotorcraft
SAE 80W-90
Premium
Rear Axle
LubricantXY-80W90-QLWSP-M2C197-A
Motorcraft
SAE 75W-140
Synthetic
Rear Axle
Lubricant
1
XY-75W140-QLWSP-M2C192-A
Automatic
transmission
fluid
(4R70/75
E-W)Motorcraft
MERCONV
AT F
2
XT-5-QMMERCONV
OHV V6
engine -
Manual
transmission
fluidMotorcraft
MERCON
AT FXT-2-QDXMERCON
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Maintenance and Specifications
219
Page 232 of 240

Oil (see
Engine oil) ............... 167
Overdrive ................. 109
P
Parking brake .......... 106
Parts (see Motorcraft
parts) ....................... 215
Power distribution box
(see Fuses)
............. 128
Power door locks
...... 54
Power mirrors
........... 46
Power point
............... 45
Power steering
........ 106
fluid, checking and
adding
.................... 194
fluid, refill
capacity
................. 215
fluid,
specifications. 218, 221
Power Windows
......... 45
R
Radio
.............. 18, 20, 25
Relays
...................... 125
Remote entry
system
........................ 57
illuminated entry
.... 60
locking/unlocking
doors
........................ 54
opening the trunk
... 57
Roadside
assistance
................ 122S
Safety Belt
Maintenance .............. 78
Safety belts (see Safety
restraints) ............ 68–72
Safety defects,
reporting .................. 152
Safety restraints .. 68–72
belt minder ............. 74
extension
assembly .................. 78
for adults ........... 69–72
for children ....... 84–85
safety belt
maintenance ............ 78
warning light and
chime ................. 73–74
Safety seats for
children ...................... 88
Seat belts (see Safety
restraints) .................. 68
Seats .......................... 64
child safety seats .... 88
front seats ............... 64
Servicing your
vehicle ...................... 161
Setting the clock
AM/FM/In-dash
6 CD ......................... 30
MACH MP3
system ..................... 23
Spare tire (see
Changing the Tire) . 130
Spark plugs,
specifications ... 215, 221
Specification chart,
lubricants ......... 218, 221
2004 Mustang(mus)
Owners Guide (post-2002-fmt)
USA English(fus)
Index
232
Page 233 of 240

Speed control ............ 46
Starting your
vehicle ........ 99–100, 103jump starting ........ 136
Steering wheel tilting ....................... 44
T
Tilt steering wheel .... 44
Tires ................. 200–201 changing 130–132, 135
snow tires and
chains .................... 214
tire grades ............. 201
treadwear .............. 201
Towing ..................... 120 recreational
towing .................... 120
trailer towing ........ 120
wrecker .................. 141
Traction control ...... 107
Traction-lok rear
axle .......................... 108
Transmission automatic
operation ............... 108
brake-shift interlock
(BSI) ...................... 108
fluid, checking
and adding
(automatic) ........... 196
fluid, checking and
adding (manual) ... 199 fluid, refill
capacities ............... 215
lubricant
specifications. 218, 221
manual operation .. 114
Trunk ......................... 54 remote release .. 50, 57
Turn signal ................ 38
V
Vehicle dimensions . 221
Vehicle Identification
Number (VIN) ......... 222
Vehicle loading ........ 117
Ventilating your
vehicle ...................... 104
W
Warning lights
(see Lights) ............... 10
Washer fluid ............ 167
Water, Driving
through .................... 116
Windows power ....................... 45
Windshield washer
fluid and wipers ........ 43 checking and
adding fluid ........... 167
replacing wiper
blades ...................... 43
Wrecker towing ....... 141
2004 Mustang (mus)
Owners Guide (post-2002-fmt)
USA English (fus)
Index
233