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. Power Steering System Drain & Refill
1.
Remove power steering reservoir and
disconnect return hose.
2.
Start engine and drain fluid into a
suitable container.
3.
Install hose and reservoir.
4.
Fill reservoir to ...