Vehicle and Power Issues
OnStar services require a vehicle electrical system, wireless service, and GPS satellite technologies to be available and operating for features to function properly. These systems may not operate if the battery is discharged or disconnected.
See also:
Engine Oil Additives/Engine Oil Flushes
Do not add anything to the oil.
The recommended oils with the dexos specification and displaying the dexos
certification mark are all that is needed for good performance and engine
protection.
...
Navigation System
If the vehicle has a navigation
system, there is a separate
navigation system manual that
includes information on the radio,
audio players, and navigation
system.
The navigation system prov ...
Fuel Range
The Fuel Range display shows the approximate distance the vehicle can be
driven without refueling.
The fuel range estimate is based on an average of the vehicle's fuel economy
over recent driving ...