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:
Gasoline Specifications
(U.S. and Canada Only)
At a minimum, gasoline should
meet ASTM specification
D 4814 in the United States or
CAN/CGSB–3.5 or 3.511 in Canada.
Some gasolines contain an
octane-enhancing additive
called methylcyclop ...
True luxury interior with real carbon fiber
The interior itself is well laid out with everything where it should be and
an easy-to-find position for performance driving. Though the leather on the
shifter does seem cheap, the coating on th ...
Multi-Band Antenna
The multi-band antenna is on the roof of the vehicle. The antenna is used
for the AM—FM radio, OnStar, the XM Satellite Radio Service System, and GPS
(Global Positioning System), if the vehicle has ...