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. Engine Oil Filter R & R
1.
Raise and support the vehicle.
2.
Place a drain pan under the oil drain
plug.
3.
Remove the oil pan drain plug.
4.
Allow the oil to drain completely.
5. ...