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than 91, the engine could be damaged and the repairs would not be covered by the vehicle warranty. If heavy

knocking is heard when using gasoline rated at 93 octane, the engine needs



Prohibited Fuels


Do not use fuels with any of the

following conditions; doing so may damage the vehicle and void its


. For vehicles which are not

FlexFuel, fuel labeled greater than 15% ethanol by volume, such as mid-level ethanol

blends (16 50% ethanol),

E85, or FlexFuel.

. Fuel with any amount of methanol, methylal, and aniline. These fuels can

corrode metal fuel system

parts or damage plastic and rubber parts.



Caution (Continued)

. Fuel containing metals such as methylcyclopentadienyl manganese tricarbonyl

(MMT), which can damage

the emissions control system and spark plugs.

. Fuel with a posted octane rating of less than the

recommended fuel. Using this fuel will lower fuel economy

and performance, and may decrease the life of the

emissions catalyst.

California Fuel Requirements

If the vehicle is certified to meet

California Emissions Standards, it is

designed to operate on fuels that meet California specifications. See the

underhood emission control label.

If this fuel is not available in states adopting California Emissions

Standards, the vehicle will operate

satisfactorily on fuels meeting federal

specifications, but emission control

system performance may be affected. The malfunction indicator lamp could turn on and the vehicle may not pass a smog-check test. See Malfunction

Indicator Lamp (Check Engine Light)

0 141. If this occurs, return to your

authorized dealer for diagnosis. If it is determined that the condition is

caused by the type of fuel used,

repairs may not be covered by the vehicle warranty.

Fuels in Foreign Countries

The U.S., Canada, and Mexico post

fuel octane ratings in anti-knock index (AKI). For fuel not to use in a foreign

country, see Prohibited Fuelsin Fuel

0 294.

Fuel Additives

To keep fuel systems clean, TOP TIER detergent gasoline is recommended.

See Fuel 0 294.

If TOP TIER detergent gasoline is not available, one bottle of GM Fuel

System Treatment Cleaner added to the fuel tank at every engine oil