1997 Buick Skylark Owner's Manual - Page 249

When to Add Oil If the oil is at or below theADD line, then you'll need of to add at least one quart oil. But you must use the right kind.This part explains what kind oil to use. of For crankcase capacity, see "Capacities and Specifications'' in the Index. I NOTICE: Don't add too much oil. your engine has If so much oil that the level gets above the upper oil mark that shows the proper operating range, your engine could be damaged. 2 4 Engine .L The engine oil fill cap on the 2.4L engine is located on the left sideof the engine by the coolant surge tank. 6-14