2014 Ford F350 Super Duty Regular Cab Owner Manual Printing 2 - Page 440

Scheduled Maintenance Off-road operation 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. Ford specification WSL-M2C192-A, part number F1TZ-19580-B, or equivalent. Add friction modifier XL-3 (EST-M2C118-A) or equivalent for complete refill of Traction-Lok rear axles. See Capacities and Specifications (page 292). Police, Taxi and Livery vehicle axle maintenance: Change rear axle fluid every 100000 miles (160000 kilometers). Rear axle fluid change may be waived if the axle was filled with 75W140 synthetic gear fluid meeting Ford specification WSL-M2C192-A, part number F1TZ-19580-B, or equivalent. Add four ounces (118 milliliters) of additive friction modifier XL-3 (EST-M2C118-A), or equivalent, for complete refill of Traction-Lok rear axles. Change the axle fluid anytime the axle submerges in water. 6.7L Diesel Engine See the diesel supplement for special operating condition information. Exceptions There are several exceptions to the Normal Schedule: Normal vehicle axle maintenance: 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 437 Super Duty (TFA)