1996 Buick LeSabre Owner's Manual - Page 238

... Engine Oil CHECK OIL LEVEL For more information, see "Check Ol Level Light" in i the Index. You should check your engine oil level .regularly; this is anadded reminder. It's a good idea to check your engine oil every time you get fuel. In order to get an accurate reading, the must .oil be warm and the vehicle must be on levelground.. 6-10