I
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
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 Oldsmobile retailer 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
Oldsmobile retailer for service.
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