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Extensive Idling or Low-speed Driving for Long Distances, as in Heavy Commercial Use
Change engine oil and filter as indicated by the information display and perform services listed in the Normal
Scheduled Maintenance chart.
As required
Replace engine air filter.Inspect frequently, service
as required
Replace cabin air filter.
Change transfer case fluid (Four-wheel drive vehicles).Every 60,000 mi
(96,000 km)
Replace spark plugs.
Operating in Dusty or Sandy Conditions (Such as Unpaved or Dusty Roads)
Replace engine air filter.Inspect frequently, service
as required
Replace cabin air filter.
Inspect the wheels and related components for abnormal noise, wear, looseness or drag.Every 5,000 mi (8,000 km)
Rotate tires, inspect tires for wear and measure tread depth.
571
Navigator (TB9) Canada/United States of America, enUSA, Edition date: 201808, Second-Printing
Scheduled Maintenance
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