Oldsmobile 2001 Silhouette - Manual (Page 342)

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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
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 behind the engine
oil dipstick. See “Engine
Compartment Overview”
in the Index for more
information on location.
Be sure to fill it enough to put the level somewhere in
the proper operating range. Push the dipstick all the way
back in when you’re through.