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Off-road operation Inspect frequently, service as required – Replace cabin air filter (if equipped). – Replace engine air filter. Every 5,000 miles (8,000 km) or 6 months – Change engine oil and replace oil filter. – Rotate tires, inspect tires for wear and measure tread Every 30,000 miles (48,000 km) – Change automatic transmission fluid (not required on 6R80 or TorqShift 姞 transmissions). – Replace front wheel bearing grease/grease seals on Every 50,000 miles (80,000 km) – Change manual transmission fluid. – Change rear axle lubricant (E-450 and F-450/550 Every 60,000 miles (96,000 km) – Change transfer case fluid (4WD vehicles). Exclusive use of E85 (Flex Fuel Vehicles only) Every oil change – If ran exclusively on E85, fill the fuel tank full with regular unleaded fuel. Scheduled Maintenance Guide 326 |