2003 Buick Regal Owner's Manual - Page 221

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 down, and check the level. Notice: 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 the proper operating range, your engine could be damaged. The engine oil fill cap is located toward the front of the engine near the yellow-looped engine oil dipstick handle. See Engine Compartment Overview on page5- 12 for more information on location. When to Add Engine Oil If the oil is at or below the the cross-hatched area at the tip of the dipstick, 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 engine oil crankcase capacity, see Capacities and Specifications on page 5-95. 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. 5-16