1999 Ford Explorer Owner Guide 1st Printing - Page 219

Maintenance and care 3. Add only enough fluid through the filler opening so that the fluid level is at the bottom of the opening. Use only fluid that meets Ford specifications. Refer to the Capacities and specifications chapter. DRIVELINE UNIVERSAL JOINT AND SLIP YOKE Your vehicle may be equipped with universal joints that require lubrication. Refer to the Scheduled Maintenance Guide for maintenance intervals. If the original universal joints are replaced with universal joints equipped with grease fittings, lubrication will also be necessary. BATTERY Your vehicle is equipped with a Motorcraft maintenance-free battery which normally does not require additional water during its life of service. However, for severe usage or in high temperature climates, check the battery electrolyte level. Refer to the Scheduled Maintenance Guide for the service interval schedules. Keep the electrolyte level in each cell up to the "level indicator". Do not overfill the battery cells. 219