1998 Ford F150 Scheduled Maintenance Guide 2nd Printing - Page 18

Severe duty schedule Items for Emission Control Service are shown in italics. The Severe Duty Schedule provides maintenance intervals for replacing your air cleaner filter if you drive in severe dust conditions. However, the conditions you drive in may require even more frequent air cleaner replacement intervals than those shown. Check with your dealer. Extremely dusty conditions will require more frequent replacement of your air filter. Check your air filter at 5,000 km (3,000 miles). If it is dirty, replace it and then keep replacing it at the same interval (every 5,000 km [3,000 miles]). If it is not dirty, check it again at 10,000 km (6,000 miles) and again at 15,000 km (9,000 miles) until you determine your unique maintenance interval. Do not go beyond 50,000 km (30,000 miles) as described in the chart. If in doubt, see your dealer. City delivery vehicles and other unique applications that require constant turning may need more frequent tire rotation. You may need to develop your own tire rotation interval based on your own observations of tire wear. If in doubt, see your dealer. Wheel lug nuts must be retightened to proper torque specifications at 800 km (500 miles) of new vehicle operation. See your dealer for proper torque specifications. Also retighten to proper torque specifications at 800 km (500 miles) after (1) any wheel change or (2) any other time the wheel lug nuts have been loosened. Police and Taxi vehicles: Replace rear axle lubricant every 160,000 kilometers (100,000 miles). Rear axle lubricant change may be waived if the axle was filled with 75W140 synthetic gear lubricant meeting Ford specification WSL-M2C192-A, part number F1TZ-19580-B or equivalent. Add four ounces of additive friction modifier C8A2-19B546-A (EST-M2C118-A) or equivalent for complete refill of Traction-Lok rear axles. The rear axle lubricant should be changed anytime the axle has been submerged in water. Non-synthetic rear axle lubricants should be replaced every 3,000 miles or 3 months whichever occurs first, during extended trailer tow operation above 21 degrees Celsius (70 degrees Fahrenheit ambient and wide open throttle for extended periods above 45 m.p.h. The 3,000 interval may be waived if the axle was filled with 75W140 synthetic gear lubricant meeting Ford specification WSL-M2C192-A, part number F1TZ-19580-B or equivalent. Add four ounces of additive friction modifier C8A2-19B546-A (EST-M2C118-A) or equivalent for complete refill of Traction-Lok rear axles. The rear axle lubricant should be 18