1993 Buick Riviera Owner's Manual - Page 111

When the "LOW OIL LEVEL" light comes on you should check your engine level andfill if necessary. oil See Engine Oil in the Index. There are three waysthe LOW light can come on briefly. Those three are normal and don't show a problem. These three ways are: 1. could be low on or you might have some other oil, oil problem. CAUTION: Don't keep drivingif the oil pressure is low. If 2. 3. 109