1998 Lincoln Navigator Scheduled Maintenance Guide 2nd Printing - Page 16

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. Non-synthetic rear axle lubricants should be replaced every 5,000 km (3,000 miles) or 3 months, whichever comes first, during extended trailer tow operation above 21°C (70°F) ambient and wide open throttle for extended periods above 72 km/h (45 mph). The 5,000 km (3,000 mile) lube change 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 C8AZ-19B546-A (EST-M2C118-A) or equivalent for complete refill of Traction-Lok௡ rear axles. The axle lubricant should be changed any time the axle has been submerged in water. Rear axles containing synthetic lubricant are lubricated for life. These lubricants are not to be checked or changed unless a leak is suspected, service required or the axle assembly has been submerged in water. The axle lubricant should be changed anytime the axle has been submerged in water. Light duty trucks equipped with Ford design front axles are lubricated for life. These lubricants are not to be checked or changed unless a leak is suspected, service required or the axle assembly has been submerged 16