FORD 2003 Windstar v.1 - Manual (Page 194)

Change your engine oil and filter according to the appropriate schedule
listed in the scheduled maintenance guide.
Ford production and aftermarket (Motorcraft) oil filters are designed for
added engine protection and long life. If a replacement oil filter is used
that does not meet Ford material and design specifications, start-up
engine noises or knock may be experienced.
It is recommended you use the appropriate Motorcraft oil filter (or
another brand meeting Ford specifications) for your engine application.
BATTERY
Your vehicle is equipped with a
Motorcraft maintenance-free battery
which normally does not require
additional water during its life of
service.
Check the battery electrolyte level under severe usage. Refer to the
Scheduled Maintenance Guide.
If the level is low, add plain tap water. If possible, use distilled water. If
the battery needs water often, have the charging system checked.
Note: The electrolyte level in each cell should be at the “level indicator”.
Do not overfill the battery cells.
Keep the top of the battery clean and dry. Also, make certain the battery
cables are always tightly fastened to the terminals. If your battery has a
cover/shield, make sure it is reinstalled after cleaning or battery
replacement.
Batteries normally produce explosive gases which can cause
personal injury. Therefore, do not allow flames, sparks or lighted
substances to come near the battery. When working near the battery,
always shield your face and protect your eyes. Always provide proper
ventilation.
Maintenance and Specifications
194