Ford Windstar Owner's Manual page 28

This light indicates the engine's oil pressure, not the oil level.
However, if your engine's oil level is low, it could affect the oil
pressure. The light will come on briefly during the display
self-test every time you turn your key to the ON position. The
light will go off when the key is turned to the START position.
The light should stay off when the self-test is done if the engine
is running with normal oil pressure. If the light comes on while
the engine is running, you have lost oil pressure and continued
operation will cause severe engine damage.
If you lose engine oil pressure:
Pull off the road as soon as safely possible.
1.
Shut off the engine immediately. If you do not stop the
2.
engine as soon as safely possible, severe engine damage
could result.
Check the engine's oil level. (See "Checking and Adding
3.
Engine Oil" in the Maintenance and Care chapter of this
Owner Guide.) If you do not follow these instructions, you
or others could be injured. To ensure an accurate reading,
your vehicle should be on level ground.
If the level is low, add only as much oil as necessary before
4.
you start the engine again. Do not overfill. Do not operate
the engine if the light is on regardless of the oil level.
Contact your nearest dealer for further service.
Low Windshield Washer Fluid Level Warning Light
This light indicates that the level of your washer fluid is low,
and you have to add more fluid. This light comes on briefly
after you turn your ignition key from the START to the ON
position. If the washer fluid is low, a one second chime will
sound and the light will remain on for 60 seconds. If the washer
fluid is not low, the light should turn off a few seconds after
the engine has started. The light and chime also come on if the
washer fluid is low when you use your windshield washers.
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