1998 Pontiac Bonneville Owner's Manual - Page 265
1998 Pontiac Bonneville Manual
Page 265 highlights
Checking Engine Oil P l out the dipstick and clean with a paper towel ul it or cloth, then pushit back in all the way. Removeit again, keeping thetip down, and check level. the When to Add Engine Oil If the oil is at or below the ADD mark, then you'll need of to add at least one quart oil. But you must use the right kind.This part explains what kind oil to use. For of crankcase capacity, see "Capacities Specifications" and in the Index. NOTICE: Don't add too muchoil. If your engine hasso 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 cap is behind the engine oil dipstick fill and engine fans. Be sure tofill it enoughto put the level somewhere in the proper operating range. Push the dipstick all the way back in when you're through. 6-14