FORD 2011 F-550 v.1 - Manual (Page 427)

Extensive idling and/or low-speed driving for long distances as in heavy
commercial use such as delivery, taxi, patrol car or livery
Inspect frequently, service as
required
– Replace cabin air filter (if equipped).
– Replace engine air filter.
Every 5,000 miles (8,000 km) – Inspect brake system.
– Rotate tires, inspect tires for wear and measure tread
depth.
– Inspect the wheels and related components for
abnormal noise, wear, looseness or drag.
– Lubricate control arm and steering ball joints (if
equipped with grease fittings).
Every 5,000 miles (8,000 km) or
6 months
– Inspect and lubricate U-joints.
Every 5,000 miles (8,000 km),
6 months or 200 hours of engine
operation
– Change engine oil and replace oil filter.
Every 15,000 miles (24,000 km) – Replace fuel filter (Ranger).
Every 30,000 miles (48,000 km) – Change automatic transmission fluid (not required on
6R80 or TorqShift ா transmissions).
– Replace wheel bearing grease and grease seals on 4x2
front wheel bearings (if non-sealed bearings are used).
Every 60,000 miles (96,000 km) – Replace spark plugs.
– Change transfer case fluid.
Scheduled Maintenance Guide
427
2011 F-250/350/450/550 (f23)
Owners Guide, 1st Printing
USA (fus)