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. Exterior Rearview Mirrors
1.
Release retainer located at top of
mirror trim panel.
2.
Lift upper door trim panel upwards
to remove.
3.
Disconnect electrical connector.
4.
Remove mirror mounting nuts, ...