Diagnostics
OnStar Vehicle Diagnostics will perform a vehicle check every month. It will check the engine, transmission, antilock brakes, and major vehicle systems.
It also checks the tire pressures, if the vehicle is equipped with the Tire Pressure Monitoring System.
If a diagnostics check is needed between e-mails, push 
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Advisor can run a check.
See also:
Environmental Concerns
Always use established trails, roads, and areas that have been set aside
for public off-road recreational driving and obey all posted regulations.
Do not damage shrubs, flowers, trees, or gras ...
Rear Seats
The vehicle's rear seats have adjustable head restraints in the outboard
seating positions.
The height of the head restraint can be adjusted. Pull the head restraint up
to raise it. Try to mo ...
What to Use
Refer to Recommended Fluids and Lubricants to determine what kind
of lubricant to use. ...