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. Preface
GENERAL MOTORS, GM, the GM Emblem,
CHEVROLET, the CHEVROLET Emblem, and
the name COBALT are registered trademarks of
General Motors.
This manual describes features that may or may
not be on your specific vehicle either because they
are options that you did not purchase or due to changes
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