1998 Oldsmobile Aurora Owner's Manual - Page 263

Engine Oil 7 3 OIL If the CHECK OIL LEVEL message or the oil warning light on the instrument panel comes on, it means you need to check your engine oil level right away. For more information, see"Check Oil Level Message" or "Oil Pressure Warning Light" in the Index. You should check your engine oil level regularly; this is an added reminder. It's a good idea to check your engine oilevery time you get fuel. In order to get an accurate reading,the 02 must be warm and the vehicle must be on level ground. Turn off the engine and give the oil a few minutes to drain back into the oil pan. If you don't, the oil dipstick might not show the actual level. When to Add Engine Oil If the oil is at or below the ADD line, 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 touse. For crankcase capacity, see "Capacitiesand Specifications" in the Index. Checking Engine Oil Pull out the dipstick and clean itwith a paper towel or cloth, then push it back in all the way. Remove it again, keeping the tip down, and check the level.