FORD 2011 F-550 v.2 - Manual (Page 435)

Off-road operation
Inspect frequently, service as
required
– Replace cabin air filter (if equipped).
– Replace engine air filter.
– Inspect and lubricate steering linkage ball joints and
U-joints (if equipped with grease fittings).
Every 5,000 miles (8,000 km) or
6 months
– Change engine oil and replace oil filter.
– Rotate tires, inspect tires for wear and measure tread
depth.
– Inspect wheels and related components for abnormal
noise, wear, looseness or drag.
Every 30,000 miles (48,000 km) – Change automatic transmission fluid (not required on
6R80 or TorqShift ா transmissions).
– Replace front wheel bearing grease/grease seals on
2WD vehicles (if non-sealed bearings are used).
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
435
2011 F-250/350/450/550 (f23)
Owners Guide, 2nd Printing
USA (fus)