1996 Cadillac DeVille Owner's Manual - Page 271

Checking Engine Oil Pull out the dipstick clean it with a paper towel or and it cloth, then push back in all the way. Remove it again, keeping the tip down, and check the level. When to Add Oil If the oil is at or below the ADD line, then you'll need to add some oil. But you must use the rightkind. This part explainswhat kind of oil to use. For crankcase and capacity, see "Capacities Specifications" in the Index. NOTICE: Don't add too much oil. If your engine has so much oil that the oil level above the upper gets mark that shows the proper operating range, your engine couldbe damaged. 6-10