Buick 1993 Century Owner's Manual page 230

The 2.2L LA engine oil dipstick is located in the
fill
cap
near the front and center of the engine compartment.
Turn off the engine and give the oil a few minutes to
drain back into the oil pan. If you don't, the oil dipstick
might not show the actual level.
To Check Engine Oil: Pull out the dipstick and dean it
with a paper towel or cloth, then push it back in a l l 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.
228