Cadillac 1996 DeVille Owner's Manual page 263

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CAUTION:
You can be injured and your vehicle could be
damaged if you try to do service work on a
vehicle without knowing enough about it.
Be sure you have sufficient knowledge,
experience, and the proper replacement
parts and tools before you attempt any
vehicle maintenance task.
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.
Fuel
U s e premiurn unleaded gasoline rated at 91 octane or
higher. At a
m i n i m u m ,
it
should meet specifications ASTM
D4814 in the United States
and
CGSB 3.5-M93 in C a n a d a .
Improved gasoline specifications have been developed by
the American Automobile Manufacturers Association
(AAMA)
for better vehicle performance and engine
protection. Gasolines meeting the
AAMA
specification
could provide improved driveability and emission control
system protection compared to other gasolines.
Be sure the posted octane for premium is at least 91. If
the octane is less than 91, you may get a heavy knocking
noise when you drive. (In an emergency, you may be
able to use a lower octane
--
as low as 87
--
if heavy
knocking does not occur.) If you're using 91 or higher
octane unleaded gasoline and you still hear heavy
knocking, your engine needs service.
If your vehicle is certified to meet California Emission
Standards (indicated on the underhood tune-up label),
it is designed to operate on fuels that meet California
specifications. If such fuels are not available in states
adopting California emissions standards, your vehicle
will operate satisfactorily on fuels meeting federal
specifications, but emission control system performance
may be affected. The malfunction indicator lamp on
your instrument panel may
turn
on and/or your vehicle
may fail a smog-check test. If this occurs, return to your
authorized Cadillac dealer for diagnosis to determine the
cause of failure. In the event it is determined that the
cause of the condition is the type of fuels used, repairs
may not be covered by your warranty.
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