1993 Buick Skylark Owner's Manual - Page 225

To Check Engine Oil: Pull out the dipstick and clean it or with a paper towel cloth, then pushit 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 to mark, then you'll need add some oil. But you must use the right kind,. This section explains what kind oil of to use. For crankcase capacity, see "Capacities and Specifications" in the Index. 224 I