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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 your engine clean and maintain optimum
vehicle performance, GM recommends the use
of gasoline advertised as TOP TIER Detergent
Gasoline.
The 8th digit of your Vehicle Identification
Number (VIN) shows the code letter or number
that identifies your engine. You will find the VIN at
the top left of the instrument panel. See Vehicle
Identification Number (VIN) on page 485.
Gasoline Octane
If your vehicle has the 3.6L V6 engine
(VIN Code 7), use regular unleaded gasoline with
a posted octane rating of 87 or higher. For
best performance or trailer towing, you may
choose to use middle grade 89 octane unleaded
gasoline. 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.
If your vehicle has the 4.6L V8 engine
(VIN Code A), use premium unleaded gasoline with
a posted octane rating of 91 or higher. You may
also use regular unleaded gasoline rated at
87 octane or higher, but your vehicle’s acceleration
may be slightly reduced, and you may notice a
slight audible knocking noise, commonly referred to
as spark knock.
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