Cadillac 1994 DeVille Owners Literature page 272

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ENGINE OIL
A CHECK OIL LEVEL message will appear when the engine oil is
approximately a quart low. If the message is displayed, check the dipstick
level and add oil as needed.
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It's a good idea to check your engine oil every time you get fuel. In order
to get an accurate reading, the oil must be warm and the vehicle must be
on level ground.
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Turn off the engine
and give the oil a few
minutes to drain back
into the oil pan. If you
don't, the oil dipstick
might not show the
actual level.
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