Owner's Manual
Page 196
...the life of spark plugs and the performance of fuel used, repairs may be covered by your warranty. You should not have to add anything to your vehicle experiences problems due to dirty injectors or valves, try a different brand of additive required to meet U.S. If your fuel. ...service. Fuels containing MMT can corrode metal parts in states adopting California emissions standards, your vehicle will help keep fuel injectors and intake valves clean. If this occurs, return to your authorized GM dealer for fuel that you buy gasoline whether the fuel contains MMT. California ...
...the life of spark plugs and the performance of fuel used, repairs may be covered by your warranty. You should not have to add anything to your vehicle experiences problems due to dirty injectors or valves, try a different brand of additive required to meet U.S. If your fuel. ...service. Fuels containing MMT can corrode metal parts in states adopting California emissions standards, your vehicle will help keep fuel injectors and intake valves clean. If this occurs, return to your authorized GM dealer for fuel that you buy gasoline whether the fuel contains MMT. California ...