Hummer H3T Owner's Manual page 268

04AKENG59_H3T.fm Page 268 Thursday, July 31, 2008 12:07 PM
Service and Maintenance
NOTICE
Use clean fuel only.
Contaminated fuel may reduce
the life of the fuel delivery
system and the engine.
Fuel containing oxygenates,
such as ethers and ethanol, and
reformulated fuel may be
available in your area.
It is recommended that you use
these fuels if they comply with
the required fuel specifications.
However, E85 (85% ethanol)
and other fuels containing
more than 10% ethanol must
not be used in vehicles that
were not designed for those
fuels.
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NOTICE
Do not use fuel containing the
octane-enhancing additive
called methylcyclopentadienyl
manganese tricarbonyl (MMT).
See your dealer for information
on additives.
NOTICE
Your vehicle was not designed
for fuels that contain methanol.
Methanol can corrode metal
parts in your fuel system and
can also damage plastic and
rubber parts. Damage caused
by the use of fuels that contain
methanol would not be
covered by your warranty.
The engine in your vehicle is
designed to accept unleaded
gasoline only. The use of leaded
gasoline could affect your vehicle's
performance as well as your
vehicle's warranty.
Use of the recommended fuel is an
important part of the proper
maintenance of your vehicle.
You should use a high quality fuel
which meets the minimum octane
rating recommended.
Be sure the posted octane is at
least 91 (research method).
The use of gasoline with an
octane rating lower than that
recommended may cause engine
knock. Continued use can cause
engine damage and void the
warranty.
If you detect a heavy engine knock
even when using a gasoline of the
recommended octane rating, have
the engine checked.