Gasoline Specifications
At a minimum, gasoline should meet ASTM specification D 4814 in the United States or CAN/CGSB-3.5 in Canada. Some gasolines may contain an octane-enhancing additive called methylcyclopentadienyl manganese tricarbonyl (MMT). General Motors recommends against the use of gasolines containing MMT.
See also:
Add-On Electrical Equipment
Notice: Do not add anything electrical to the vehicle unless you check with your
dealer first. Some electrical equipment can damage the vehicle and the damage would
not be covered by the vehicle&# ...
OnStar®
OnStar® uses several innovative technologies and live
advisors to provide a wide range of safety, security,
navigation, diagnostics, and calling services. ...
Cleaning Exterior Lamps/Lenses
Use only lukewarm or cold water, a soft cloth and
a car washing soap to clean exterior lamps
and lenses. ...