Owner's Manual
Page 272
... additives that you should not have to add anything to contain additives that were not designed for those fuels. General Motors recommends that will help keep fuel injectors and intake valves clean, or if your warranty. 272 However, some gasolines contain only the minimum amount... of additive required to dirty injectors or valves, look for fuel that is advertised as ethers and ethanol, and reformulated ...
... additives that you should not have to add anything to contain additives that were not designed for those fuels. General Motors recommends that will help keep fuel injectors and intake valves clean, or if your warranty. 272 However, some gasolines contain only the minimum amount... of additive required to dirty injectors or valves, look for fuel that is advertised as ethers and ethanol, and reformulated ...