Ford Super Duty Owner's Manual page 409

408
Inspect frequently,
service as required
Every 5000 miles
(8000 km) or six
months
Every 30000 miles
(48000 km)
Every 50000 miles
(80000 km)
Every 60000 miles
(96000 km)
*
Vehicles equipped with dual rear wheels should rotate the front wheels
when specified; rear wheels only if unusual wear is noted.
Exclusive Use of E85 (Flex Fuel Vehicles Only)
Every oil change
interval
2013 F-250/350/450/550 (f23)
Owners Guide gf, 1st Printing
USA (fus)
Scheduled Maintenance
Off-road Operation
Inspect steering linkage, ball joints and U-joints,
Lubricate if equipped with grease fittings.
Replace engine air filter.
Change engine oil and filter.
Inspect the wheels and related components for
abnormal noise, wear, looseness or drag.
*
Rotate tires , inspect tires for wear and measure
tread depth.
Replace front wheel bearing grease and grease
seals if non-sealed bearings are used.
Change rear axle fluid (F-450/550 only).
Change transfer case fluid (4WD vehicles).
If ran exclusively on E85, fill the fuel tank full
with regular unleaded fuel.