1997 Pontiac Firebird Owner's Manual - Page 259

When to Add Oil If the oil is at or below theADD line, then you'll need to add some oil. But you must use the right kind. This part explains what kind oil to use, For of crankcase capacity, see "Capacitiesand Specifications" in the Index, What Kind of Oil to Use Oils recommendedfor your vehicle can identified by be looking for the "Starburst" symbol. This symbol indicates that the oil has been certifiedthe American by Petroleum Institute(BPI). Do not use any oil which does notcarry this Starburst symbol. NOTICE: Don't add too muchoil. If your engine has so much oil that the oil level gets above the L c P cross-hatched area that shows the proper operating range, your enginecould be damaged, b - : ' I --P 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. you have your oil changed for you, be sure the oil put into your engine is American Pewoleurn Institute certified for gasoline engines. If you change your own oil, be sure you use oil that has the Starburst symbol on the front of the oilcontainer. If You should also use the proper viscosity oil your for vehicle, as shown in the following chart: 6-14