1996 GMC Safari Owner's Manual - Page 241

Engine Oil If the CHECK OIL light on the instrument panel comes on, it means you need to check your engine oil level right away. For more information, see "Check Oil Light" in the Index. CHECK OIL You should check your engine oil level regularly; this is an added reminder. It's a good idea to check your engine oil every time you get fuel. In order to get an accurate reading, the oil must be warm and the vehicle must be on level ground. The engine oil dipstick is a yellow ring. 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. 11