1995 Buick Regal Owner's Manual - Page 217

When to Add Oil If the oil is at or below the ADD mark, then you'll need to add some 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. NOTICE: Don't add too much If your enginehas oil. so much oil that the oil level gets above the cross-hatched area that shows the proper operating range, your engine could be damaged. 3.1L L82 (Code M) Engine 3.8L L27 (Code L) Engine 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. 6-9