Cadillac 1994 Eldorado Owners Literature page 264

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.
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.
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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