Page 492 of 506

SPECIAL OPERATING CONDITIONS
If you operate your vehicleprimarilyin any of the following conditions,
you need to perform additional maintenance as indicated. If you
occasionallyoperate your vehicle under any of these conditions, it is
not necessary to perform the additional maintenance. For specific
recommendations, see your dealership service advisor or technician.
Towing a trailer or using a car-top carrier
Inspect frequently,
service as requiredInspect and lubricate U-joints, if equipped with
grease fittings.
See axle maintenance items under
Exceptions.
Every 5000 miles
(8000 km)Inspect wheels and related components for
abnormal noise, wear, looseness or drag.
Rotate tires, inspect tires for wear and
measure tread depth.
Every 5000 miles
(8000 km) or
six monthsChange engine oil and filter.
*
Inspect and lubricate U-joints, if equipped with
grease fittings.
Every 60000 miles
(96000 km)Change transfer case fluid (4WD vehicles).
*Reset your oil life monitoring system after each engine oil and filter
change. See theInstrument Clusterchapter.
Extensive idling or low-speed driving for long distances as in
heavy commercial use (such as delivery, taxi, patrol car or
livery)
Inspect frequently,
service as requiredReplace engine air filter.
Every 5000 miles
(8000 km)Inspect brake system.
Inspect wheels and related components for
abnormal noise, wear, looseness or drag.
Lubricate control arm and steering ball joints if
equipped with grease fittings.
Rotate tires, inspect tires for wear and
measure tread depth.
Scheduled Maintenance491
2014 Navigator(nav)
Owners Guide gf, 1st Printing, June 2013
USA(fus)
Page 493 of 506

Extensive idling or low-speed driving for long distances as in
heavy commercial use (such as delivery, taxi, patrol car or
livery)
Every 5000 miles
(8000 km) or
six monthsChange engine oil and filter.
*
Every 60000 miles
(96000 km)Change transfer case fluid (4WD vehicles).
Replace spark plugs.
*Reset your oil life monitoring system after each engine oil and filter
change. See theInstrument Clusterchapter.
Operating in dusty or sandy conditions such as unpaved or
dusty roads
Inspect frequently,
service as requiredReplace engine air filter.
Every 5000 miles
(8000 km)Inspect the wheels and related components for
abnormal noise, wear, looseness or drag.
Rotate tires, inspect tires for wear and
measure tread depth.
Every 5000 miles
(8000 km) or
six monthsChange engine oil and filter.
*
Inspect and lubricate U-joints, if equipped with
grease fittings.
Every 60000 miles
(96000 km)Change transfer case fluid (4WD vehicles).
*Reset your oil life monitoring system after each engine oil and filter
change. See theInstrument Clusterchapter.
492Scheduled Maintenance
2014 Navigator(nav)
Owners Guide gf, 1st Printing, June 2013
USA(fus)
Page 494 of 506
Off-road operation
Inspect frequently,
service as requiredInspect steering linkage, ball joints and
U-joints. Lubricate if equipped with grease
fittings.
Replace engine air filter.
Every 5000 miles
(8000 km)Change engine oil and filter.
*
Inspect the wheels and related components for
abnormal noise, wear, looseness or drag.
Rotate tires, inspect tires for wear and
measure tread depth.
Every 60000 miles
(96000 km)Change transfer case fluid (4WD vehicles).
*Reset your oil life monitoring system after each engine oil and filter
change. See theInstrument Clusterchapter.
Exclusive use of E85 (flex fuel vehicles only)
Every oil change If ran exclusively on E85, fill the fuel tank full
with regular unleaded fuel.
Scheduled Maintenance493
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USA(fus)
Page 505 of 506

Snowplowing ...............................16
SOS Post Crash Alert .................50
Spark plugs,
specifications .....................319, 324
Special notice
ambulance conversions ............16
Specification chart,
lubricants ...................................320
Stability system .........................194
Starting a flex fuel vehicle .......161
Starting your vehicle ........160–161
jump starting ..........................235
Status bars ................................415
Steering wheel ............................84
controls ......................................84
tilting .........................................84
Supplemental Restraint System
(SRS) (see airbags) ....................51
Suspension ................................204
SYNC® AppLink™ ...................392
SYNC® customer support ........365
SYNC® Services ........................388
System overview .......................412
T
Temperature control
(see Climate control) .......119, 121
Text messaging .........................376
Text messaging (sending,
downloading, deleting) .....377, 379
Third-row power fold seat .......143
Tilt steering wheel ......................84
Tires ...........................289–290, 310alignment ................................303
care ..........................................289
changing ..........................310, 312
checking the pressure ............299
inflating ...................................297
label .........................................296
replacing ..................................301
rotating ....................................303
safety practices .......................302
sidewall information ...............292
snow tires and chains ............304
spare tire .................................310
terminology .............................291
tire grades ...............................290
treadwear ........................290, 299
Towing .......................216, 226–227
recreational towing .................227
trailer towing ..........................216
wrecker ....................................226
Traction control ........................192
Traffic, Directions and
Information ................................388
Trailer sway control ..................217
Transmission
brake-shift interlock (BSI) ....179
fluid, checking and adding
(automatic) .............................263
fluid, refill capacities ..............320
lubricant specifications ..........320
Troubleshooting ................359, 466
Turn signal ..................................91
U
Universal garage door opener ..145
USB port ....................................344
Using privacy mode ..................373
504Index
2014 Navigator(nav)
Owners Guide gf, 1st Printing, June 2013
USA(fus)