1996 Ford Explorer Scheduled Maintenance Guide 1st Printing - Page 51

u Inspect parking brake system for damage and operation. u Change transfer case oil (4x4). u Change manual transmission oil. (1) Extremely dusty conditions will require more frequent replacement of your air filter. Check your air filter at 3,000 miles (5,000 km). If it is dirty replace it and then keep replacing it at the same interval (every 3,000 miles [5,000 km]). If it's not dirty, check it again at 6,000 miles (10,000 km) and again at 9,000 miles (15,000 km) until you determine your unique maintenance interval. Do not go beyond 30,000 miles (50,000 km) as described in the chart. If in doubt, see your dealer. (2) If you operate your vehicle "off road" in water that is deeper than the hubs (1/2 wheel height) then these items must be serviced daily. (3) 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. (4) Wheel lug nuts must be retightened to proper torque specifications at 500 miles/800 km of new vehicle operation (100 miles/160 km and 500 miles/800 km for vehicles equipped with dual rear wheels or equipped for snowplowing). Proper torque specifications are provided in your Owner Guide. Also retighten to proper torque specification at 500 miles/800 km after (1) any wheel change or (2) any other time the wheel lug nuts have been loosened. (5) At 60,000 miles (96,000 km) your dealer will replace the PCV valve at no cost except on Canada and California vehicles. Severe Duty Schedule 51