Oldsmobile 1995 88 Owner's Manual page 117

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NOTICE:
Damage to your engine from neglected oil
problems can be costly and is not covered by your
warranty.
The oil pressure warning light could also come on in
three other situations:
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When the ignition is on but the engine is not running,
the light will come on as a test to show you it is
working, but the light will go out when you turn the
ignition to start. If it doesn't come on with the
ignition on, you may have a problem with the fuse or
bulb. Have it fixed right away.
Sometimes when the engine is idling at a stop, the
light may blink on and off. This is normal.
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If you make a hard stop, the light may come on for a
moment. This is normal.
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