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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.
You should ask your service station operators if their
gasolines contain deposit control additives and
oxygenates, and if they have been reformulated to
reduce vehicle emissions.
5.7L
LT1
(Code
P)
Engine
Use premium unleaded gasoline rated at
91
octane or
higher
for
best performance. You may use middle grade
or regular unleaded gasolines, but your vehicle may not
accelerate as well. The gasoline you use should meet
specifications
ASTM
D4814 in the United States and
CGSB
3.5-92
in Canada. These fuels should have the
proper additives,
so
you should not have to add anything
to the fuel.
In the United States and Canada, it’s easy to be sure you
get the right kind of gasoline (unleaded). You’ll see
UNLEADED
right on the pump. And only unleaded
nozzles will fit into your vehicle’s filler neck.
Be sure the posted octane for premium
is
at least 91 (at
least
89
for middle grade and 87 for regular).
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 91 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.
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