Additives
Important: Using the recommended fuel (gasoline) is important for proper maintenance of the engine. To help keep the engine clean and maintain optimum vehicle performance, it is recommended to use gasoline advertised as TOP TIER detergent gasoline. Any resulting engine damage due from the use of unapproved fuel (gasoline) would not be covered by the vehicle warranty.
Notice: Do not use ethanol fuel (E85) in the vehicle. The engine is not designed for this fuel, and serious engine damage will result if it is used.
To provide cleaner air, all gasoline in the United States is now required to contain additives that help prevent engine and fuel system deposits from forming, allowing the emission control system to work properly. In most cases, you should not have to add anything to the fuel. However, some gasolines contain only the minimum amount of additive required to meet EPA regulations. To help keep fuel injectors and intake valves clean, or if the vehicle experiences problems due to dirty injectors or valves, look for gasoline that is advertised as TOP TIER detergent gasoline.
For those who do not use TOP TIER detergent gasoline regularly, one bottle of GM Fuel System Treatment Plus, added to the fuel tank at every engine oil change, can help clean deposits from fuel injectors and intake valves. GM Fuel System Treatment Plus is the only gasoline additive recommended.