Fuel; Gasoline Specifications - Buick 2003 Regal Owner's Manual

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
5-88.
Gasoline Octane
If your vehicle has the 3800 V6 engine (VIN Code K), 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 higer 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 3800 Supercharged V6 engine
(VIN Code I ) , use only premium unleaded gasoline with a
posted octane of 91 or higher. In an emergency, you may
be able to use a lower octane
-
as low as 87
-
if heavy
knocking does not occur. Refill your tank with premium
fuel as soon as possible. Otherwise, you might damage
your engine. If you are using 91 octane or higher-octane
fuel and you hear heavy knocking, your engine needs
service.
Gasoline Specifications
It is recommended that gasoline meet specifications
which were developed by the American Automobile
Manufacturers 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.
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