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Towing a Trailer or Using a Car-top Carrier
Change engine oil and filter as indicated by the information display and perform services listed in the Normal
Scheduled Maintenance chart.
As required
Inspect and lubricate U-joints (if equipped with grease fittings).Inspect frequently, service
as required
See 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
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.
550
Navigator (TB9) Canada/United States of America, enUSA, First-Printing
Scheduled Maintenance
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