2013 Ford F350 Super Duty Super Cab Owner Manual Printing 3 - Page 416

Scheduled Maintenance 415 Operating in dusty or sandy conditions such as unpaved or dusty roads Every 50000 miles Change rear axle fluid (F-450/550 only). (80000 km) Every 60000 miles Change transfer case fluid (4WD vehicles). (96000 km) Vehicles equipped with dual rear wheels should rotate the front wheels when specified; rear wheels only if unusual wear is noted. Inspect frequently, service as required Every 5000 miles (8000 km) or six months 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). * 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 If ran exclusively on E85, fill the fuel tank full interval with regular unleaded fuel. 2013 F-250/350/450/550 (f23) Owners Guide gf, 3rd Printing, December 2012 USA (fus)