1999 Oldsmobile 88 Owner's Manual - Page 229

yellowblue 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. 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 located behind the engine fans and in front of the engine oil fill cap. The top of the dipstick is a round, yellow loop. Turn off the engine and give the oil several minutes to drain back into the oil pan. If you don't, the oil dipstick might not show the actual level. 6-11