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. 2005-10 Cobalt
After changing engine oil, Engine
Oil Life System must be reset as follows:
1.
Turn ignition to RUN, with engine off.
2.
Press information and reset buttons
on DIC at same time to enter personalization menu.
...