Muting a Call
During a call, all sounds from inside the vehicle can be muted so that the person on the other end of the call cannot hear them.
To mute a call, press 
and
then say “Mute Call.”
To cancel mute, press and
then say “Un-mute Call.”
See also:
Hands-Free Calling
1. Push . System responds:
“OnStar ready.”.
2. Say “Dial.” System responds:
“Please say the name or number
to call.”.
3. Say the entire number without
pausing, including a “1” and the
area c ...
Setting the Clock
The navigation system time and the analog clock operate independently. Changing
the time through the navigation system does not change the time on the analog clock.
See Clock to change ...
Selecting the Right Engine Oil
Selecting the right engine oil
depends on both the proper oil
specification and viscosity grade.
See Recommended Fluids and
Lubricants. ...