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. Engine Compartment Overview
When you open the hood on the 2.2L L4 engine, here is what you will see:
A. Engine Air Cleaner/Filter (2.0L Turbo Engine) or Engine Air Cleaner/Filter
(2.2L Engine).
B. Engine Oil Fill Cap. See “When to Add Engine Oil”
under Engine Oil.
C. Engine Oil Dipstick (Out of View). See “Checkin ...