Ford 1998 Windstar Owner's Manual page 289

Normal operating temperature is reached after driving
approximately 20 miles (32 km). The fluid level should be
within the crosshatched area on the dipstick.
Adding Automatic Transaxle Fluid
The fluid type is stamped on the dipstick. Before adding any
fluid, be sure that the correct type will be used.
Add fluid in 1/2 pint (0.25 liter) increments through the filler
tube to bring the level to the correct area on the dipstick. If an
overfill occurs, excess fluid should be removed by a qualified
technician.
NOTE: Always dispose of used automotive fluids in a
responsible manner. Follow your community's
standards for disposing of these types of fluids. Call
your local recycling center to find out about recycling
automotive fluids.
NOTE: Always use Motorcraft MERCON or equivalent
MERCON automatic transaxle fluid when you refill
your automatic transaxle fluid.
Battery
The Motorcraft maintenance-free battery normally does not
require additional water during its life of service. However, for
severe service usage or in high temperature climates, check your
battery electrolyte level, at least every 24 months or 24,000 miles
(40,000 km). Keep the electrolyte in each cell up to the "level"
indicator. Do not overfill the battery cell. For longer, trouble-free
operation, keep the top of the battery clean and dry. Also, make
certain the battery cables are always tightly fastened to the
battery terminals.
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