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 methylcyclopentadienyl manganese tricarbonyl (MMT).
We recommend against the use of gasolines containing MMT. See Additives for additional information.
Gasoline Octane
California FuelChevrolet Cobalt Owners Manual. Electronic Stability Control (ESC)/ Traction Control System (TCS)
Indicator/Warning Light
For vehicles with the
Electronic Stability
Control (ESC) system
or the Traction Control
System (TCS), the
indicator/warning light
comes on briefly when
the engine is started.
If it does not, have the vehicle serviced by the
dealer/retailer. If the system is working normally the
indicator ...