User Manual - Page 220

For 2003 ALERO.

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Fuel
Use of the recommended fuel
is
an important part of the
proper maintenance of your vehicle.
Gasoline Octane
Use regular unleaded gasoline with a posted octane
of
87
or higher. If the octane is less than
87,
you may
get a heavy knocking noise when you drive.
If
this
occurs, use a gasoline rated at
87
octane or higher as
soon as possible. Otherwise, you might damage
your engine.
A
little pinging noise when you accelerate
or drive uphill is considered normal. This does not
indicate a problem exists or that a higher-octane fuel is
necessary.
If
you are using
87
octane or higher-octane
fuel and hear heavy knocking, your engine needs
service.
Gasoline
Specifications
It is recommended that gasoline meet specifications
which were developed by the American Automobile
Manufacturers Association and endorsed by the
Canadian Vehicle Manufacturers Association for better
vehicle performance and engine protection. Gasoline
meeting these specifications could provide improved
driveability and emission control system performance
compared to other gasoline.
In Canada, look for the
“Auto Makers’ Choice”
label on the pump.
5-5
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