Adding Equipment to the Outside of Your Vehicle- Page 247

6-4

If you have the 3800 Supercharged V6 engine 
(VIN Code 1), use premium unleaded gasoline rated 
at 91 octane or higher. With the 3800 Supercharged
engine, in an emergency, you may be able to use a lower
octane 

--

 as low as 87 

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 if heavy knocking does not

occur. If you are using 91 or higher octane unleaded
gasoline and you hear heavy knocking, your engine
needs service.

It is recommended that the gasoline meet specifications
which have been developed by the American Automobile
Manufacturers Association (AAMA) and endorsed by 
the Canadian Motor Vehicle Manufacturers Association
for better vehicle performance and engine protection.
Gasolines meeting the AAMA specification could
provide improved driveability and emission control
system performance compared to other gasolines.

Be sure the posted octane for premium is at least 91 
(at least 87 for regular). If the octane is less than 87, 
you may get a heavy knocking noise when you drive. 
If it’s bad enough, it can damage your engine.

If your vehicle is certified to meet California Emission
Standards (indicated on the underhood emission control
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. (See “Malfunction

Indicator Lamp” in the Index.) If this occurs, return to
your authorized Buick 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.

Some gasolines that are not reformulated for low
emissions may contain an octane

-

enhancing additive

called methylcyclopentadienyl manganese tricarbonyl
(MMT); ask your service station operator whether or 
not the fuel contains MMT. General Motors does not
recommend the use of such gasolines. If fuels containing
MMT are used, spark plug life may be reduced and your
emission control system performance may be affected.
The malfunction indicator lamp on your instrument
panel may turn on. If this occurs, return to your
authorized Buick dealer for service.