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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 399.
If your vehicle has the 3.5L V6 engine (VIN Code K
only), you may use either regular unleaded gasoline
or ethanol fuel containing up to 85% ethanol (E85);
also see Fuel E85 (85% Ethanol) on page 301.In
all other engines, use only regular unleaded
gasoline.
Gasoline Octane
For all vehicles except those with the 5.3L
V8 engine (VIN Code C), 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.
If your vehicle has the 5.3L V8 engine (VIN Code
C), 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. If the octane is less than
87, you may notice 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. If
you are using gasoline rated at 87 octane or higher
and you hear heavy knocking, your engine
needs service.
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