2015 Ford F450 Super Duty Crew Cab Owner Manual Printing 2 - Page 449

Scheduled Maintenance Off-road operation Inspect frequently, service as required Inspect steering linkage, ball joints and U-joints, Lubricate if equipped with grease fittings. Replace engine air filter. Every 5000 miles (8000 km) or six months 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. * Every 30000 miles (48000 Replace front wheel bearing grease and grease seals if km) non-sealed bearings are used. Every 50000 miles (80000 Change rear axle fluid (F-450 and F-550 only). km) Every 60000 miles (96000 Change transfer case fluid (Four-wheel drive vehicles). km) * Vehicles 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 interval If ran exclusively on E85, fill the fuel tank full with regular unleaded fuel. Rear axles and power take-off units with synthetic fluid and light-duty trucks equipped with Ford-design axles are lubricated for life; do not check or change fluid unless a leak is suspected, service is required or the assembly has been submerged in water. During long periods of trailer towing with outside temperatures above 70°F (21°C) and at wide-open throttle for long periods above 45 mph (72 km/h), change non-synthetic rear axle fluid every 3000 miles (4800 kilometers) or three months, whichever comes first. This interval can be waived if the axle is filled with 75W140 synthetic gear fluid meeting 6.7L Diesel Engine See the diesel supplement for special operating condition information. Exceptions There are several exceptions to the Normal Schedule: Axle Maintenance Change the axle fluid anytime an axle is submerged in water. 446 Super Duty (), enUSA