2002 Cadillac DeVille Owner's Manual - Page 164

Oil Pressure Light This light tells you if there could be a problem with your engine oil pressure. CAUTION: Don't keep driving if the oil pressure is low. If you do, your engine can become so hot that it catches fire. You or others could be burned. Check your oil as soon as possible and have your vehicle serviced. The light goes on when you turn your key to ON or START. It goes off once you start your engine. That's a check to be sure the light works. If it doesn't come on, be sure to have it fixed so it will be there to warn you if something goes wrong. When the light comes on and stays on, it means that oil isn't flowing through your engine properly. You could be low on oil and you might have some other system problem. NOTICE: Damage to your engine from neglected oil problems can be costly and is not covered by your warranty. 2-96