2011 Ford F450 Super Duty Crew Cab Owner Guide 4th Printing - Page 441

Scheduled Maintenance Class A Motorhome: Change brake fluid every two years. Hot climate oil change intervals: If operating conditions are normal and you drive your vehicle under typical, everyday conditions and you are using an API performance category oil of SL or later (for example SM, etc.) then you can follow the 7,500 mile (12,000 km) normal service oil change intervals schedule. Vehicles operating in the Middle East, North Africa, Sub-Saharan Africa or locations with similar climates must follow the oil change interval of 3,000 mile (4,800 km) if the owner is using oils defined by the American Petroleum Institute (API) performance category of API SK or earlier (for example SJ, etc). Edge/MKX AWD only - vehicles operating off-road in sand during high ambient temperatures must replace the AWD PTU (All-wheel drive Power Transfer Unit) lube every 20,000 miles (32,000 km). Engine air filter & cabin air filter replacement: Engine air filter and cabin air filter life is dependent on exposure to dusty and dirty conditions. Vehicles operated in these conditions will require frequent inspection and replacement of the engine air filter and cabin air filter. ENGINE COOLANT CHANGE RECORD Initial change After initial change 6 years or 105,000 miles (168,000 km) (whichever comes first) Every 3 years or 45,000 miles (72,000 km) 441 2011 F-250/350/450/550 (f23) Owners Guide, 4th Printing USA (fus)