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.
Chevrolet Cobalt Service & Repair Manual. Wheel Alignment
Preliminary Inspection
1.
Ensure all tires are of recommended
size and are inflated to proper pressure.
2.
Inspect all tires for damage and uneven
tread wear.
3.
Ensure wheel bearings, control arm
...