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 Service & Repair Manual. Malfunction Indicator Lamp, Diagnosis & Testing
The Malfunction Indicator Lamp
(MIL) is located on the Instrument Panel Cluster (IPC). The MIL informs
the driver that an emission system fault has occurred and that the engine
control system requires service. The Engine Control Module (ECM) monitors
the MIL control circuit fo ...