Pontiac 1993 Trans Sport Owner's Manual page 218

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Fuel
Use regular unleaded gasoline rated at
87 octane or higher. It should meet
specifications ASTM D4814 in the U.S.
and CGSB 3.5-92 in Canada. These
fuels should have the proper additives,
so you should not have to add anything
t o the fuel.
I
In
the U.S. and Canada, it's easy to be
sure you get the right kind of gasoline
(unleaded). You'll see "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.
What about gasoline with blending
materials that contain oxygen, such as
MTBE or alcohol?
MTBE is "methyl tertiary-butyl
ether:' Fuel that is no more than
1 5 %
MTBE is fine for your vehicle.
Ethanol is ethyl or grain alcohol.
Properly-blended fuel that is no morc
than 10% ethanol is fine for your
vehicle.
Methanol is methyl or wood alcohol
NOTICE
- l
Fuel that is more than 5 %
methanol is bad for your
Don't use it. It can corrode me
parts in your fuel system and
damage plastic and rubber pa
That damage wouldn't be cove
under your warranty. And
5 % or less, there must be
"cosolvents" and corrosio
preventers in this fuel to helD avola
Fuel Capacity: 20 U.S. Gallons (76L).
Use unleaded fuel only.
2 1 7
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