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
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 the recommended octane
or
higher and you still hear heavy knocking, your
engine needs service.
But
dm9t
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, b’ut 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 Pontiac 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
sctane-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
Pontiac dealer for service.
6-4
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