1996 Pontiac Trans Sport Owner's Manual - Page 266

Checking Engine Oil Pull out the dipstick clean it with a paper towelor and cloth, then push it back in all the way. Remove it again, keeping the tip down, and check the level. 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 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.