Extensive idling or low-speed driving for long distances as inheavy commercial use (such as delivery, taxi, patrol car or livery)
As required Change engine oil and filter as indicated by the information display and perform services
listed in the Normal Scheduled Maintenance
chart.
Inspect frequently,
service as required Replace engine air filter.
Every 60000 miles
(96000 km) Replace spark plugs.
Change transfer case fluid (Four–wheel drive
vehicles).
Operating in dusty or sandy conditions such as unpaved or
dusty roads
Inspect frequently,
service as required Replace 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
months Change engine oil and filter.
*
Every 60000 miles
(96000 km)
Change transfer case fluid (Four–wheel drive
vehicles).
*Reset your Intelligent Oil-Life Monitor after each engine oil and filter
change. See the Instrument Cluster chapter.
462Scheduled Maintenance
2015 Navigator (nav)
Owners Guide gf, 2nd Printing, December 2014
USA (fus)
Off-road operation
Inspect frequently,
service as required Inspect steering linkage, ball joints and
U-joints. Lubricate if equipped with grease
fittings.
Replace engine air filter.
Every 5000 miles
(8000 km) or six
months Change engine oil and filter.
*
Inspect wheels and related components for
abnormal noise, wear, looseness or drag.
Rotate tires, inspect tires for wear and
measure tread depth.
Every 30000 miles
(48000 km) Replace front wheel bearing grease and grease
seals if non-sealed bearings are used (2WD
vehicles).
Every 60000 miles
(96000 km) Change transfer case fluid (Four–wheel drive
vehicles).
*Reset your Intelligent Oil-Life Monitor after each engine oil and filter
change. See the Instrument Cluster chapter.
Scheduled Maintenance 463
2015 Navigator(nav)
Owners Guide gf, 2nd Printing, December 2014
USA (fus)
