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. Taillamps and Turn Signal Lamps (Coupe)
To replace this bulb:
1. Open the trunk.
2. Remove the trunk trim and pull back fastener.
3. Disconnect the wiring harness by lifting up on the
tab to release and pull it straight out.
4. Turn the bulb socket counterclockwise and pull it
straight out of the taillamp assembly.
5. Pull the ol ...