Pontiac 2004 Vibe - Manual (Page 227)

When to Add Engine Oil
If the oil is at or below the hole at the tip of the dipstick,
then you will need to add at least one quart of oil.
But you must use the right kind. This section explains
what kind of oil to use. For engine oil crankcase
capacity, see
Capacities and Specifications on
page 5-101.
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.
See Engine Compartment Overview on page 5-12 for
the location of the engine oil fill cap.
Be sure to add enough oil to put the level somewhere in
the proper operating range. Push the dipstick all the
way back in when you are through.
5-17