Owner's Manual
Page 214
... specifications. The malfunction indicator lamp could turn on and the vehicle might not be affected. Additives To provide cleaner air, all gasolines in states adopting California emissions standards, the vehicle will operate satisfactorily on fuels meeting federal specifications, but... emission control system performance might be covered by General Motors. 5-6 To help keep fuel injectors and intake valves clean, or if the vehicle experiences problems due to dirty injectors or valves, look for diagnosis. GM Fuel System Treatment PLUS...
... specifications. The malfunction indicator lamp could turn on and the vehicle might not be affected. Additives To provide cleaner air, all gasolines in states adopting California emissions standards, the vehicle will operate satisfactorily on fuels meeting federal specifications, but... emission control system performance might be covered by General Motors. 5-6 To help keep fuel injectors and intake valves clean, or if the vehicle experiences problems due to dirty injectors or valves, look for diagnosis. GM Fuel System Treatment PLUS...