Buick 1993 Skylark Owner's Manual page 225

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 upper
mark, 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.
224
I