Pontiac 1998 Grand Am Owner's Manual page 237

If your vehicle is certified to meet California Emission
Standards (indicated on the underhood emission control
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 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 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 aEected. The
malfunction indicator lamp on your instrument panel
may turn on. If this occurs, return to your authorized
Pontiac dealer
for
service.
To provide cleaner air, all gasolines in the United States
are now required to contain additives that will help
prevent deposits from forming
in
your engine and fuel
system, allowing your emission control system to
function properly. Therefore, you should not have
to
add
anything to the fuel. In addition, gasolines containing
oxygenates, such as ethers and ethanol, and
reformulated gasolines may be available in your area to
help clean the a i r . General Motors recommends that you
use these gasolines if they comply with the
specifications described earlier.
I
NOTICE:
Your vehicle w a s not designed for fuel that
contains methanol. 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.
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