Ford 1999 Windstar Owner's Manual page 200

Maintenance and care
CHECKING AND ADDING POWER STEERING FLUID
• 3.0L V6 Vulcan engine
• 3.8L OHV V6 engine
Check the power steering fluid. Refer to the Scheduled Maintenance
Guide for the service interval schedules. If adding fluid is necessary, use
only MERCON ATF.
200