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Extensive idling or low-speed driving for long distances as in
heavy 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.
456 Scheduled Maintenance
2015 Navigator (nav)
Owners Guide gf, 1st Printing, July 2014
USA (fus)
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