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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
service.
Prohibited Fuels
Caution
Do not use fuels with any of the
following conditions; doing so may damage the vehicle and void its
warranty:
. 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.
(Continued)
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 Fuels” in Fuel
0 294.
Fuel Additives
To keep fuel systems clean, TOP TIER detergent gasoline is recommended.
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
