1993 Cadillac DeVille Owner's Manual - Page 140

m If it does notcome on at all, have it fixedright away. If it stays on, or it comes on while you are driving, the computer is indicating that you have a problem. You should take your vehicle in for service soon. Oil Light This light tells you if there could be a problem with your engine oil pressure. "START"It goes The light goes on when you turn your key to "Run" or off once you have started your engine. That's just a check to be sure the so light works. If it doesn't, be sureto have it fixed it will be there towarn you if something goes wrong. When this light comes on and stavs on, it means oil isn't going through your engine properly. You could be low on oil, or you might have some other oil problem. I: