Fuel; Adding Equipment To The Outside Of Your Vehicle; Gasoline Octane - Pontiac Grand Prix 2007 Owner's Manual

Adding Equipment to the Outside of
Your Vehicle
Things you might add to the outside of your
vehicle can affect the airflow around it. This may
cause wind noise and affect windshield washer
performance. Check with your dealer before

adding equipment to the outside of your vehicle.

Fuel

Use of the recommended fuel is an important part
of the proper maintenance of your vehicle. To
help keep the engine clean and maintain optimum
vehicle performance, GM recommends the use
of gasoline advertised as TOP TIER Detergent
Gasoline.
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The 8th digit of the Vehicle Identification Number
(VIN) shows the code letter or number that
identifies your vehicle's engine. The VIN is at the
top left of the instrument panel. See Vehicle
Identification Number (VIN) on page 465.

Gasoline Octane

If your vehicle has the 3800 V6 engine
(VIN Code 2), use regular unleaded gasoline with
a posted octane rating of 87 or higher. If the
octane rating is less than 87, you may notice an
audible knocking noise when you drive, commonly
referred to as spark knock. If this occurs, use a
gasoline rated at 87 octane or higher as soon
as possible. If you are using gasoline rated at
87 octane or higher and you hear heavy knocking,
your engine needs service.