2003 Oldsmobile Alero Owner's Manual - Page 232

When to Add Engine Oil If the oil is at or below the MIN mark for the 2.2L L4 ECOTEC engine or below the cross-hatched area at the tip of the dipstick for the 3400 V6 engine, 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 5-86 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. IA I SAE 5W-30 For the location of the engine oil fill cap see El 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. 5-17