Chevrolet 2008 Impala, Owner'S Manual, Page: 264 / 400

When to Add Engine Oil
If the oil is below the cross-hatched area at the tip of
the dipstick, you need to add at least one quart/liter
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 5-103.
Notice: Do not add too much oil. If the engine has
so much oil that the oil level gets above the
cross-hatched area that shows the proper operating
range, the engine could be damaged.
See Engine Compartment
Overview on page 5-14
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 in the cross-hatched area.
Push the dipstick all the way back in when you are
through.
V6 Engine
V8 Engine
5-18