Ford Windstar Owner's Manual page 300

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 does not require
additional water during its life of service. The vents are part of
the cover and cannot be removed. For longer, trouble-free
operation, keep the top of the battery clean and dry. Also, make
certain the battery cables are tightly fastened to the battery
terminals.
If you see any corrosion on the battery cables or terminals,
remove the cables from the terminal and clean them both with a
wire brush. You can neutralize the acid with a solution of
baking soda and water. Reinstall the cables when you are done
cleaning them, and apply a small quantity of grease to the top
of each battery terminal to help prevent corrosion.
Battery replacement
If your original equipment battery requires replacement while
under warranty, it may, in some cases, be replaced by a
Motorcraft low-maintenance battery. The low-maintenance
battery has removable vent caps for checking the electrolyte
level and for adding water, if needed.
Check your battery's electrolyte level, at least every 12 months
or 12,000 miles (20,000 km), in temperatures up to 90˚F (32˚C).
Keep the electrolyte in each cell up to the "level" indicator. Do
not overfill the battery cell.
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