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.
Engine oil system flushes are not recommended and could cause engine damage not covered by the vehicle warranty.
See also:
Using this Manual
To quickly locate information about
the vehicle, use the Index in
the back of the manual. It is an
alphabetical list of what is in the
manual and the page number
where it can be found. ...
Voice Recognition
The navigation system's voice recognition allows for hands-free operation of
the navigation system, audio system, and OnStar (if equipped) features.
Voice recognition can be used when the ignit ...
Footnotes — Maintenance
Schedule Additional Required
Services — Severe
a) Vehicles with different size front
and rear tires do not have tire
rotation. See Tire Rotation.
b) Or every two years, whichever
comes first.
c) Check all fuel and vapor lines
and hoses f ...