Adding Equipment To The Outside Of Your Vehicle; Fuel; Gasoline Octane - Cadillac Escalade 2003 Owner's Manual

CAUTION: (Continued)
•
Be sure to use the proper nuts, bolts and
other fasteners. "English" and "metric"
fasteners can be easily confused. If you
use the wrong fasteners, parts can later
break or fall off. You could be hurt.
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

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 5-102 .
5-4

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.