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 
, and an
Advisor can run a check.
See also:
Gasoline Specifications
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 methylcyclopentadie ...
Tire Rotation and Required
Services Every 12 000 km/7,500 mi
Rotate the tires, if recommended for
the vehicle, and perform the
following services. See Tire
Rotation.
• Check engine oil level and oil
life percentage. If needed,
change engine oil and ...
Infotainment
Read the following pages to become familiar with the audio system's features.
WARNING
Taking your eyes off the road for extended periods could cause a crash resulting
in injury or death to y ...