1993 Pontiac Bonneville Owner's Manual - Page 232

Engine Oil It's a good idea to check your engine oil every time you get fuel. In order to get an accurate reading, the oil mustbe 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. To Check Engine Oil: Pull out the dipstick and clean it with a paper towel or cloth, then push it back in all the way. Remove it again, keeping the tip lower. 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 right kind. This section explains what kind of oil to use. For crankcase capacity, see theZr.z&x under Capacities & Specijicatiow. Don't add too much oil. If your engine has so much oil that the oil level gets above the cross-hatched area that shows theproper operating range, your engine could be damaged. Just 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. I 2 1 3