Ford F-250 Owner's Manual page 431

Inspect frequently, service as
Every 5,000 miles (8,000 km) or
Every 30,000 miles (48,000 km) – Change automatic transmission fluid (except 6R80 and
Every 50,000 miles (80,000 km) – Change manual transmission fluid
Every 60,000 miles (96,000 km) – Change transfer case fluid (4WD vehicles)
Exclusive use of E85 (Flex Fuel Vehicles only)
Every oil change interval – If ran exclusively on E85, fill the fuel tank full with
2011 F-250/350/450/550 (f23)
Owners Guide, 3rd Printing
USA (fus)
Scheduled Maintenance Guide
Off-road operation
– Inspect steering linkage, ball joints and U-joints;
required lubricate if equipped with grease fittings
– Replace cabin air filter (if equipped)
– Replace engine air filter
– Change engine oil and filter
6 months
– Inspect wheels and related components for abnormal
noise, wear, looseness or drag
– Rotate tires, inspect tires for wear and measure tread
depth
TorqShift transmissions)
– Replace front wheel bearing grease/grease seals if
non-sealed bearings are used (2WD vehicles)
– Change rear axle fluid (E-450 and F-450/550 only)
regular unleaded fuel
431