Buick 1993 LeSabre Owner's Manual page 239

To Check Engine Oil:
Pull out the dipstick and clean it
with a paper towel or cloth, then push it back in all the
way. Remove it again, keeping the tip lower.
When to Add Oil: If the oil is at or below the ADD
line, then you'll need to add some oil. But you must use
the right kind. This section explains what kind of oil to
use. For crankcase capacity, see "Capacities and
Specifications" in the Index.
1
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.
Use the engine oil fill cap next to the oil dipstick to add
oil.
Just 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.
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