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Off-road operation
Inspect frequently, service as
required
– Inspect steering linkage, ball joints and U-joints;
lubricate if equipped with grease fittings
– Replace cabin air filter (if equipped)
– Replace engine air filter
Every 5,000 miles (8,000 km) or
6 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 30,000 miles (48,000 km) – Change automatic transmission fluid (except 6R80 and
TorqShiftா transmissions)
– Replace front wheel bearing grease/grease seals if
non-sealed bearings are used (2WD vehicles)
Every 50,000 miles (80,000 km) – Change manual transmission fluid
– Change rear axle lubricant (E-450 and F-450/550
only)
Every 60,000 miles (96,000 km) – Change transfer case fluid (4WD vehicles)
Exclusive use of E85 (Flex Fuel Vehicles only)
Every oil change – If ran exclusively on E85, fill the fuel tank full with
regular unleaded fuel.
Scheduled Maintenance Guide
358
2011 Navigator (nav)
Owners Guide, 1st Printing
USA (fus)