FORD 2015 F-550 v.1 - Manual (Page 447)

Other maintenance items
Replace front wheel bearing grease and grease seal if non-
sealed bearings are used.
Replace spark plugs. Every 97500 miles (156000
km)
Change engine coolant. **
Every 105000 miles
(168000 km)
Replace rear axle fluid.
Inspect accessory drive belt(s). ***
Change automatic transmission fluid and filter on 6-speed
transmission. Consult dealer for requirements.
Every 150000 miles
(240000 km) Replace accessory drive belt(s) if not replaced within the
last 100000 miles (160000 km).
Replace front wheel bearings and seals if non-sealed
bearings are used.
* If your vehicle has climate-controlled (heated and cooled) seats.
** Initial replacement at six years or 105000 miles (168000 kilometers), then every three
years or 45000 miles (72000 kilometers).
*** If not replaced, inspect every 15000 miles (24000 kilometers).
6.7L Diesel Engine
See the diesel supplement for scheduled
maintenance information.
SPECIAL OPERATING
CONDITIONS SCHEDULED
MAINTENANCE
6.2L and 6.8L Gasoline Engines
If you operate your vehicle primarily in any
of the following conditions, you need to
perform extra maintenance as indicated.
If you operate your vehicle occasionally
under any of these conditions, it is not
necessary to perform the extra
maintenance. For specific
recommendations, see your dealership
service advisor or technician.
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Super Duty (), enUSA
Scheduled Maintenance