2003 Cadillac DeVille Owner's Manual - Page 286

When to Add Engine Oil If the oil is at or below the cross-hatched area at the tip of the dipstick, you'll then need to add at least one quart of oil. But you must use the right kind. This part explains what kind of oil to use. For engine oil crankcase capacity, see Capacities and Specifications on page 5- 101 Notice: Don't add too much oil. If your engine has so much oil that the oil level gets above the upper mark that shows the proper operating range, your engine could be damaged. I ~ The engine oil fill cap is located behind the radiator 03 the passenger'sside 1 of the vehicle. For more information on location, see Engine Compartment Overview on page 5-72. Turn the cap counterclockwise to remove it. Be sure to fill it enough to put the level somewhere in the proper operating range in the cross-hatched area. Push the dipstick all the way back in when you're through. 5-15