1994 Cadillac Eldorado Owner's Manual - Page 264

ENGINE OIL A "CHECK OIL LEVEL" message will appear when the engine oil is approximately aquart low. If the message is displayed, check dipstick the level and add oil as needed. It's a good idea to check your engine oil every time get fuel.In order you to get an accurate reading, the oil must be warm and vehicle must be the on level ground. Turn off the engine and givethe oil a few minutes to drain back into the oil pan. If you don't, the oil dipstick might show the actual level. not 252