Ford Grand Marquis Owner's Manual page 30

Engine Oil Pressure Light
The engine oil pressure light
This light indicates the engine oil pressure, not
the oil level. However, if your engine's oil level
is low, it could affect the oil pressure. The light
should come on every time your ignition key is
turned to ON or START, and should go out
when the engine starts. If the light stays on or
turns 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:
1. Pull off the road as soon as safely possible.
2. Shut off the engine immediately. If you do
not stop the engine as soon as safely
possible, severe engine damage could result.
3. Check the engine's oil level, following the
instructions on checking and adding engine
oil, see Engine Oil in the Index. If you do
not follow these instructions, you or others
could be injured. To assure an accurate
reading, your vehicle should be on level
ground.
4. If the level is low, add only as much oil as
necessary before 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 service as
soon as possible.
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