FORD 2013 F-550 v.1 - Manual (Page 408)

Extensive Idling or Low-speed Driving for Long Distances as in
Heavy Commercial Use (i.e., Delivery, Taxi, Patrol Car or Livery)
Every 5000 miles
(8000 km) or six
months Change engine oil and filter.
Inspect and lubricate U-joints.
Every 30000 miles
(48000 km) Replace front wheel bearing grease and grease
seals if non-sealed bearings are used.
Every 60000 miles
(96000 km) Change transfer case fluid (4WD vehicles).
Replace spark plugs.
* Vehicles equipped with dual rear wheels should rotate the front wheels
when specified; rear wheels only if unusual wear is noted.
Operating in Dusty or Sandy Conditions Such as Unpaved or
Dusty Roads
Inspect frequently,
service as required Replace engine air filter.
Every 5000 miles
(8000 km) Inspect the wheels and related components for
abnormal noise, wear, looseness or drag.
Rotate tires * , inspect tires for wear and measure
tread depth.
Every 5000 miles
(8000 km) or six
months Change engine oil and filter.
Inspect and lubricate U-joints.
Every 30000 miles
(48000 km) Replace front wheel bearing grease and grease
seals if non-sealed bearings are used.
Every 50000 miles
(80000 km) Change rear axle fluid (F-450/550 only).
Every 60000 miles
(96000 km) Change transfer case fluid (4WD vehicles).
* Vehicles equipped with dual rear wheels should rotate the front wheels
when specified; rear wheels only if unusual wear is noted.
Scheduled Maintenance 407
2013 F-250/350/450/550 (f23)
Owners Guide gf, 1st Printing
USA (fus)