1999 Cadillac Catera Owner's Manual - Page 250

yellowblue When to Add Engine Oil If the oil is at or below the MIN mark, then you'll 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 crankcase capacity, see "Capacities and Specifications" in the Index. Be sure to fill it enough to put the level somewhere in the proper operating range. Push the dipstick all the way back in when you're through. What Kind of Engine Oil to Use Oils recommended for your vehicle can be identified by looking for the "Starburst" symbol. This symbol indicates that the oil has been certified by the American Petroleum Institute (API). Do not use any oil which does not carry this Starburst symbol. If you change your own oil, be sure you use oil that has the Starburst symbol on the front of the oil container. If you have your oil changed for you, be sure the oil put into your engine is American Petroleum Institute certified for gasoline engines. You should also use the proper viscosity oil for your vehicle, as shown in the following chart: 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. The oil fill cap is located behind the engine oil dipstick and next to the engine block on the driver's side of the engine. Turn the yellow cap counterclockwise to remove it. 6-12