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:
Passing Another Vehicle While Using Cruise Control
Use the accelerator pedal to increase the vehicle speed. When you take your foot
off the pedal, the vehicle will slow down to the previous set cruise speed. ...
How to Check Automatic Transmission Fluid
Notice: Too much or too little fluid can damage the transmission. Too much can
mean that some of the fluid could come out and fall on hot engine parts or exhaust
system parts, starting a fire. Too ...
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. ...