See also:

What to Use
WARNING: Adding only plain water to the cooling system can be dangerous. Plain water, or some other liquid such as alcohol, can boil before the proper coolant mixture will. The vehicle’s cool ...

OnStar®
If the vehicle has OnStar and you subscribe to the OnStar services, please refer to the OnStar Terms and Conditions for information on data collection and use. ...

ENGINE OIL LOW — ADD OIL
This message displays when the engine oil level is too low. Check the oil level. See Engine Oil. ...