Cadillac 1993 Fleetwood Owners Literature page 267

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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.
Gasolines for Cleaner &r
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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
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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
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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.
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In addition, some gasoline suppliers are now producing reformulated
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gasoline. By doing so, you can help clean the air, especially in those parts
gasolines. These gasolines are specially designed to reduce vehicle
emissions. General Motors recommends that you use reformulated
of the country that have high ozone levels.
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