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Be sure
the
posted octane is at least
87.
If the octane is less than
87,
you
may get a heavy knocking noise when you drive.
If
it’s bad enough,
it
can
damage your engine.
If you’re using
fuel
rated at
87
octane or higher and you still hear heavy
knocking, your engine needs service. But don’t worry
if
you hear
a
little
pinging noise when you’re accelerating or driving up
a
hill.
That’s normal
and
you
don’t have
to
buy a higher octane fuel
to
get rid
of
pinging. It’s the
heavy, constant knock that means
you
have
a
problem.
What about gasoline
with
blending materials that contain oxygen
(oxygenates), such as MTBE or alcohol?
MTBE
is “methyl tertiary-butyl
ether.’’
Fuel that is no more than
15%.
MTBE
is
fine for
your
vehicle.
Ethanol
is ethyl or grain alcohol. Properly-blended
fuel
that is
no
more than
10%
ethanol
is fine for your vehicle.
Methnrzol
is
methyl
or wood alcohol.
~
NOTICE:
Fuel that is more than
5%
methanol is bad for your vehicle.
Don’t use it.
It
can corrode metal parts in your fuel system and
also damage plastic and rubber parts. That damage wouldn’t be
covered under your warranty. And even at
5%
or less, there
must be “cosolvents” and corrosion preventers in this fuel to
help avoid these problems.
Gasolines
for
Cleaner Air
Your use
of
gasoline with deposit control additives
will
help prevent
deposits from forming
in
your engine and fuel system. That helps keep your
engine
in
tune and your emission control system working properly. It’s good
for
your
vehicle, and you’ll be doing your part
for
cleaner air.
Many gasolines are now blended with oxygenates. General Motors
recommends that you use gasolines with these blending materials, such as
MTBE and ethanol. By doing so,
you
can help clean the air, especially
in
those
parts
of
the
country that have high carbon monoxide
levels.
In addition, some gasoline suppliers are now producing reformulated
gasolines. These gasolines are specially designed
to
reduce vehicle
emissions. General Motors recommends that
you
use reformulated gasoline.
By doing
so,
you
can help clean the air, especially
in
those parts
of
the
country that have high ozone levels.
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