Fuel - Buick 1993 Century Owner's Manual

Fuel
Use r e d a r unleaded gasoline rated at 87 octane or
What about gasoline with blending materials that contain
oxygen, such as MTBE or alcohol?
higher.-It should meet-specifications ASTM D4814 in the
m E
is 66methyl kfliq+.bu@l Fuel that is no
U.S. and CGSB 3.5-92 in Canada. These fuels should
more than
1 5 %
MTBE is fine for your vehicle.
have the proper additives, so you should not have to add
a n - g t o the fuel. Ethanol is ethyl or grain alcohol. Properly-blended fuel
that is no more than 10% ethanol is fine for your vehicle.
In the
U.S.
and Canada, it's easy to be sure you get the
right kind of gasoline (unleaded). You'll see
Methanol is methyl or wood alcohol.
"UNLEADED" right on the pump. And only unleaded
nozzles will fit into your vehicle's filler neck.
Be sure the posted octane is at least 87. 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 you're using fuel rated at 87 octane or higher and .you
still hear heavy knocking, your engine needs service. But
don't worry if you hear a little pinging noise when you're
accelerating or driving up a h i l l . That's normal, and you
don't have to buy
a
higher octane fuel to get rid of
pinging. It's the heavy, constant knock that means you
have a problem.
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