Recommended Fuel
Use regular unleaded gasoline with a posted octane rating of 87 or higher. If the octane rating is less than 87, an audible knocking noise, commonly referred to as spark knock, might be heard when driving. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible. If heavy knocking is heard when using gasoline rated at 87 octane or higher, the engine needs service.
See also:
Traction Control System (TCS)
The traction control system limits
wheel spin. The system turns on
automatically every time the vehicle
is started.
• To turn off traction control, press
and release the Traction Control
...
Storing and Deleting Phone Numbers
The system can store up to 30 phone numbers as name tags in the Hands-Free Directory
that is shared between the Bluetooth and OnStar systems.
The following commands are used to delete and store pho ...
Tire Inspection
We recommend that the tires, including the spare tire, if the vehicle has one, be inspected for signs of wear or damage at least once a month.
Replace the tire if:
► The indicators at three or ...