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:
Clock
The analog clock is not connected with any other vehicle system and runs by itself.
To adjust the clock, do the following:
1. Locate the adjustment button, near the lower left corner of the clock.
...
Viscosity Grade
SAE 5W–30 is the best viscosity
grade for the vehicle. Do not use
other viscosity grade oils such as
SAE 10W–30, 10W–40, or 20W–50.
If in an area of extreme cold,
where the temperature falls ...
Using the Tire Sealant and Compressor Kit without Sealant to Inflate a Tire
(Not Punctured)
To use the air compressor to inflate a tire with air only and not sealant:
If a tire goes flat, avoid further tire and wheel damage by driving slowly to
a level place. Turn on the hazard warning ...