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. Cobalt & G5
Recommended Service
Service Interval
BODY
Inspect Lamps, Seat Belt & Warning Devices
At Least Once Every 6 Months
Lubricate Hinges, Latches, Lock Cylinders & Strikers
A ...