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. Customer Satisfaction Procedure
Your satisfaction and goodwill are important to your
dealer and to Chevrolet. Normally, any concerns with
the sales transaction or the operation of the vehicle
will be resolved by the dealer's sales or service
departments. Sometimes, however, despite the best
intentions of all concerned, misund ...