Page 217 of 240

TRANSMISSION FLUID
Checking automatic transmission fluid
The 5R55S transmission does not have a transmission fluid dipstick.
Refer to yourScheduled Maintenance Guidefor scheduled intervals for
fluid checks and changes. Your transmission does not consume fluid.
However, the fluid level should be checked if the transmission is not
working properly, i.e., if the transmission slips or shifts slowly or if you
notice some sign of fluid leakage.
Transmission fluid should be checked and, if required, fluid
should be added by a qualified technician.
Before adding any fluid, make sure the correct type is used. Use only
MERCONV automatic transmission fluid. The type of fluid used is
indicated on the transmission fluid pan, extension housing and also in
theLubricant specificationssection in this chapter.
Use of a non-approved automatic transmission fluid may cause
internal transmission component damage and void the warranty.
Do not use supplemental transmission fluid additives, treatments or
cleaning agents. The use of these materials may affect transmission
operation and result in damage to internal transmission components.
2005 05+ Mustang(197)
Owners Guide (post-2002-fmt)
USA_English(fus)
Maintenance and Specifications
217
Page 218 of 240
Checking and adding manual transmission fluid (if equipped)
1. Clean the filler plug.
2. Remove the filler plug and inspect the fluid level.
3. Note: There are two different manual transmissions used in this
vehicle and they have different fluid levels. For vehicles equipped with a
V6 engine the correct manual transmission fill level is at the lower edge
of the filler hole. For vehicles equipped with a V8 engine the correct
manual transmission fill level is 1.3 cm (1/2 inch) below the edge of the
filler hole.
2005 05+ Mustang(197)
Owners Guide (post-2002-fmt)
USA_English(fus)
Maintenance and Specifications
218
Page 219 of 240
•Fill level for V6
•Fill level for V8
4. Add enough fluid through the filler opening to bring the fluid up to
the recommended levels.
5. Install and tighten the fill plug securely.
Use only fluid that meets Ford specifications. Refer toLubricant
specificationsin this chapter.
MOTORCRAFT PART NUMBERS
Component 4.0L V6 engine 4.6L V8 engine
Air filter element FA-1773 FA-1773
Fuel filter FG-1083 FG-1083
Battery BXT-96R BXT-96R
Battery - (with High Electrical content) BXT-40R BXT-40R
Oil filter FL-820-S FL-820-S
PCV valve
1(non-serviceable)
Spark Plugs2
1The PCV valve is a critical emission component. It is one of the items
listed in theScheduled Maintenance Guideand is essential to the life
and performance of your vehicle and to its emissions system.
2005 05+ Mustang(197)
Owners Guide (post-2002-fmt)
USA_English(fus)
Maintenance and Specifications
219
Page 220 of 240

For PCV valve replacement, see your dealer or a qualified service
technician. Refer to theScheduled Maintenance Guidefor the
appropriate intervals for changing the PCV valve.
Replace the PCV valve with one that meets Ford material and
design specifications for your vehicle, such as a Motorcraft or
equivalent replacement part. The customer warranty may be void
for any damage to the emissions system if such a PCV valve is not
used.
2For spark plug replacement, see your dealer or a qualified service
technician. Refer to theScheduled Maintenance Guidefor the
appropriate intervals for changing the spark plugs.
Replace the spark plugs with ones that meet Ford material and
design specifications for your vehicle, such as Motorcraft or
equivalent replacement parts. The customer warranty may be
void for any damage to the engine if such spark plugs are not
used.
REFILL CAPACITIES
Fluid Ford Part
NameApplication Capacity
Brake fluid Motorcraft High
Performance
DOT 3 Motor
Vehicle Brake
FluidAll Between MIN
and MAX lines
on reservoir
Engine oil
(includes filter
change)
6
Motorcraft SAE
5W-20 Premium
Synthetic Blend
Motor Oil (US)
Motorcraft SAE
5W-20 Super
Premium Motor
Oil (Canada)4.6L V8 engine6.0 quarts (5.7 L)
Motorcraft SAE
5W-30 Super
Premium Motor
Oil4.0L V6 engine 5.0 quarts
(4.7L)
2005 05+ Mustang(197)
Owners Guide (post-2002-fmt)
USA_English(fus)
Maintenance and Specifications
220
Page 221 of 240

Fluid Ford Part
NameApplication Capacity
Engine coolant
1Motorcraft
Premium Gold
Engine Coolant
(yellow-colored)4.0L V6 engine 12.5 quarts
(11.8L)
4.6L V8 engine 12.72 quarts
(13.4L)
Power steering
fluidMotorcraft
MERCONAT F4.0L V6 engine Fill to between
MIN and MAX
lines on
reservoir 4.6L V8 engine
Rear axle
lubricant
2Motorcraft SAE
75W-140
Synthetic Rear
Axle Lubricant7.5 inch axle
(V6)3.25 pints (1.5L)
8.8 inch axle
(V8)4.25 pints (2.0L)
Fuel tank N/A All 16.0 gallons
(60.6L)
Transmission
fluid–
Automatic
3
Motorcraft
MERCONV
AT FAll 11.9 quarts
(11.2L)4
Transmission
fluid–Manual3Motorcraft
MERCONAT F4.0L V6 engine 2.75 quarts
(2.6L)5
4.6L V8 engine 3.2 quarts
(3.0L)5
Windshield
washer fluidMotorcraft
Premium
Windshield
Washer
ConcentrateAll 4.0 quarts
(3.8L)
1Add the coolant type originally equipped in your vehicle.
2Rear axle lubricants do not need to be checked or changed unless a
leak is suspected, service is required or the axle assembly has been
submerged in water. The axle lubricant should be changed any time the
rear axle has been submerged in water. Fill 1/4 inch to 9/16 inch (6 mm
to 14 mm) below bottom of fill hole. Add 4 oz. (118 ml) of Additive
Friction Modifier XL-3 or equivalent meeting Ford specification
EST-M2C118–A for complete refill of Traction-Lok axles.
2005 05+ Mustang(197)
Owners Guide (post-2002-fmt)
USA_English(fus)
Maintenance and Specifications
221
Page 222 of 240

3Ensure the correct automatic transmission fluid is used. MERCONand
MERCONV are not interchangeable. DO NOT mix MERCONand
MERCONV. Refer to yourScheduled Maintenance Guideto
determine the correct service interval.
4Approximate dry capacity, includes cooler and tubes. Fluid level should
be checked by a qualified service technician.
5Service refill capacity is determined by filling the transmission to the
bottom of the filler hole with the vehicle on a level surface.
6Use of synthetic or synthetic blend motor oil is not mandatory. Engine
oil need only meet the requirements of Ford specification WSS-M2C929-a
(4.0L) or WSS-M2C930-A (4.6L) and the API Certification mark.
LUBRICANT SPECIFICATIONS
Item Ford part
nameFord part
numberFord
specification
Brake fluid Motorcraft High
Performance
DOT 3 Motor
Vehicle Brake
FluidPM-1 ESA-M6C25-A
and DOT 3
Door
weatherstripsSilicone
LubricantXL-6 ESR-M13P4-A
Door latch, hood
latch, auxiliary
hood latch,
striker plates,
seat tracks and
fuel filler door
hingeMulti-Purpose
GreaseXG-4 or XL-5 ESR-M1C159-A
or ESB-M1C93-B
Engine coolant Motorcraft
Premium Gold
Engine Coolant
(yellow-colored)VC-7-A (U.S.,
except CA and
OR), VC-7-B
(CA and OR
only)WSS-M97B51–A1
2005 05+ Mustang(197)
Owners Guide (post-2002-fmt)
USA_English(fus)
Maintenance and Specifications
222
Page 223 of 240
Item Ford part
nameFord part
numberFord
specification
Engine oil4.6L engine
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-M2C
930-Awith API
Certification
Mark
4.0L V6 engine
Motorcraft SAE
5W-30 Super
Premium Motor
OilXO-5W30-QSP WSS-M2C929-A
and API
Certification
Mark
Lock cylinders Penetrating and
Lock LubricantMotorcraft XL-1 none
Power steering
fluidMotorcraft
MERCONAT FXT-2-QDX MERCON
Rear Axle
LubricantMotorcraft SAE
75W-140
Synthetic Rear
Axle Lubricant
1
XY-75W140-QL WSP-M2C192-A
Automatic
transmission
fluidMotorcraft
MERCONV
AT F
2
XT-5-QM MERCONV
Manual
transmission
fluid–4.0L
V6/4.6L V8Motorcraft
MERCONAT FXT-2-QDX MERCON
2005 05+ Mustang(197)
Owners Guide (post-2002-fmt)
USA_English(fus)
Maintenance and Specifications
223
Page 224 of 240

Item Ford part
nameFord part
numberFord
specification
Disc brake
caliper railsMotorcraft
Silicone Brake
Caliper Grease
and Dielectric
CompoundXG-3-A ESE-M1C171-A
Windshield
washer fluidMotorcraft
Premium
Windshield
Washer
ConcentrateZC-32–A WSB-M8B16–A2
1Add 118 ml (4 oz.) of Additive Friction Modifier XL-3 or equivalent
meeting Ford specification EST-M2C118-A for complete refill of
Traction-Lok axles.
Ford design rear axles contain a synthetic lubricant that does not require
changing unless the axle has been submerged in water.
2Ensure the correct automatic transmission fluid is used. MERCONand
MERCONV are not interchangeable. DO NOT mix MERCONand
MERCONV. Refer to yourScheduled Maintenance Guideto
determine the correct service interval.
ENGINE DATA
Engine 4.0L V6 engine 4.6L V8 engine
Cubic inches 245 281
Required fuel 87 octane 87 octane
Firing order 1-4-2-5-3-6 1-3-7-2-6-5-4-8
Ignition system EDIS Coil on plug
Spark plug gap 0.052–0.054 inch
(1.32–1.42 mm)0.040–0.050 inch
(1.02–1.27 mm)
1
Compression ratio 9.7:1 9.8:1
1The spark plug gap is not adjustable on the 4.6L V8.
2005 05+ Mustang(197)
Owners Guide (post-2002-fmt)
USA_English(fus)
Maintenance and Specifications
224