Buick 1993 Roadmaster Owner's Manual page 246

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 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
ak,
especially in those parts of the country that have high
carbon monoxide levels.
In addition, som-e gasoline suppliers are now .producing
reforniulated 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.
.