Brake Fluid Maintenance1
Change the brake fluid.2Every Three Years
1 Perform this maintenance item every three years. Do not exceed the designated time for the interval.2 Brake fluid servicing requires special equipment available at your authorized dealer.
Other Maintenance Items 1
Replace the cabin air filter.Every 20,000 mi (32,000 km)
Replace the engine air filter.Every 30,000 mi (48,000 km)
Replace the spark plugs.
Every 100,000 mi (160,000 km)
Inspect the accessory drive belt(s). 2
Change the automatic transmission fluid.
Every 150,000 mi (240,000 km)Change the front axle fluid - Four-wheel drive vehicles.
Change the rear axle fluid.
Change the transfer case fluid - Four-wheel drive vehicles.
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2023 Navigator (TB9) Canada/United States of America, enUSA, Edition date: 202207, DOMScheduled Maintenance
Towing a Trailer or Using a Car-top Carrier
Change engine oil and filter as indicated by the instrument cluster display and perform services listed in theNormal Scheduled Maintenance chart.As required
Inspect and lubricate U-joints (if equipped with grease fittings).Inspect frequently, serviceas requiredSee axle maintenance items under Exceptions.
Change transfer case fluid (Four-wheel drive vehicles).Every 60,000 mi(96,000 km)Replace spark plugs.
Extensive Idling or Low-speed Driving for Long Distances, as in Heavy Commercial Use (Such as Delivery, Taxi, Patrol Car or Livery)Short Trips that do not allow the engine to get to operating temperature causing fuel dilution and an increase of the engine oil level
Change engine oil and filter as indicated by the instrument cluster display and perform services listed in theNormal Scheduled Maintenance chart.As required
Replace engine air filter.Inspect frequently, serviceas requiredReplace cabin air filter.
Change transfer case fluid (Four-wheel drive vehicles).Every 60,000 mi(96,000 km)Replace spark plugs.
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2023 Navigator (TB9) Canada/United States of America, enUSA, Edition date: 202207, DOMScheduled Maintenance
