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At
a
minimum, the gasoline
you
use
should meet
specifications ASTM
D4814
in the United States and
CGSB
3.5-M93
in
Canada. Improved gasoline
specifications have been developed by the American
Automobile Manufacturers Association (AAMA) for
better vehicle performance and engine protection.
Gasolines meeting the AAMA specification could
provide improved driveability and emission control
system protection compared to other gasolines.
Be
sure
the posted octane for premium is at least
9
1
(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 the recommended 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.
If your vehicle
is
certified to meet California Emission
Standards (indicated
on
the underhood tune-up label),
it is designed to operate
on
fuels that meet California
specifications.
If
such fuels are not available in states
adopting California emissions standards, your vehicle
will operate satisfactorily
on
fuels meeting federal
specifications, but emission control system performance
may be affected. The malfunction indicator lamp on
your instrument panel may turn
on
and/or your vehicle
may fail
a
smog-check test. If this occurs, return to your
authorized Chevrolet dealer for diagnosis to determine
the cause of failure. In the event it is determined that the
cause
of
the condition
is
the type of fuels used, repairs
may not be covered by your warranty.
Some gasolines that are not reformulated for low
emissions contain an octane-enhancing additive called
methylcyclopentadienyl manganese tricarbonyl (MMT);
ask your service station operator whether or not his fuel
contains MMT. General Motors does not recommend the
use
of
such gasolines. If fuels containing MMT are used,
spark plug life may be reduced and your emission
control system performance may be affected. The
malfunction indicator lamp
on
your instrument panel
may turn on. If this occurs, return to your authorized
Chevrolet dealer
for
service.
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