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The 8th digit of your vehicle identification number
(VIN) shows the code letter for your engine. You will
find the VIN at the top left of your instrument panel.
(See "Vehicle Identification Number" in the Index.)
If you don't have the 5.7L Code
P
engine, use regular
unleaded gasoline rated at 87 octane or higher.
If you have the 5.7L Code
P
engine, use premium
unleaded gasoline rated at 91 octane or higher for best
performance. You may use middle grade or regular
unleaded gasolines, but your vehicle may not accelerate
as well.
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 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.
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