Buick 2002 Century - Manual (Page 262)

6-12
When to Add Engine Oil
If the oil is at or below the ADD mark, then you’ll need
to add at least one quart of oil. But you must use the
right kind. This part explains what kind of oil to use. For
engine oil 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.
The engine oil fill cap is located toward the front of the
engine near the engine oil dipstick handle. See “Engine
Compartment Overview” in the Index for more
information on location.