Fuel
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
5-98.
Gasoline Octane
If
your vehicle has the
5.3L
engine (VIN Code T), 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
you hear heavy knocking, your engine needs service.
If your vehicle has the
6.0L
HO
engine (VIN Code N), use
premium unleaded gasoline with a posted octane of
91
or
higher for best performance.
You
may also use, middle
grade or regular unleaded gasoline rated at 87 octane or
higher, but your vehicle’s acceleration may be slightly
reduced.
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.
Gasoline Specifications
It
is recommended that gasoline meet specifications
which were developed by the American Automobile
Manufaxturers 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.
Canada Only
In Canada, look for the
“Auto Makers’ Choice”
label on the pump.
5-5
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