Chevrolet 1993 S-10 Pickup Owner's Manual page 253

If you're using fuel rated at 91 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 hill. 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 15% MTBE is
fine for your vehicle.
Ethanol is ethyl or grain alcohol. Properly-blended fuel that is no more than
10% ethanol is fine for your vehicle.
Methanol is methyl or wood alcohol.
-uel that is more than
5%
methanol is bad for your vehicle. Don't use
il
'
an corrode metal parts in your fuel system and also damage plastic
ma
rubber parts. That damage wouldn't be covered under your Wa-
Znd even at 5% or less, there must be "cosolvent!
"
and corrosion
Ireventers in this fuel to help avoid these problem!
I
Gasolines for Cleaner Air
Your use of gasoline with detergent additives will help prevent deposits from
forming in your engine and fuel system. That helps keep your engine in tune
and your emission control system working properly. It's good for your vehicle,
and you'll be doing your part for cleaner air.
Many gasolines are now blended with materials called oxygenates. General
Motors recommends that you use gasolines with these blending materials,
such as MTBE and ethanol. By doing
so, you can help clean
the air,
especially in those parts
of
the country that have high carbon monoxide
levels.
In addition, some gasoline suppliers are now producing reformulated
gasolines. These gasolines are specially designed to reduce vehicle
emissions. General Motors recommends that you use reformulated gasoline.
By doing so, you can help clean the air, especially in those parts of the
country that have high ozone levels.
You should ask your service station operators if their gasolines contain
detergents and oxygenates, and if they have been reformulated to reduce
vehicle emissions.
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