1993 CHEVROLET ASTRO PASSENGER octane

Downloaded from www.Manualslib.com manuals search engine Service & Appearance Care
NOTICE I-
Fuel
The 8th digit of your Vehicle Identification Number (VIN) sho\
ws the code letter for your engine. You will find the VIN at the top left of your instrument
panel. (See “Vehicle Identification Number” in the Index.)\

Use regular unleaded gasoline rated at 87 octane or higher. Wi\
th the 4.3L
(Code
W) engine, use premium unleaded gasoline rated at 91 octane or .
higher for high power performance, when towing a trailer or wi\
th a high
payload requirement. But when operating with a light load as a\
normal
condition, you may use middle grade or regular unleaded gasolin\
es.
The gasoline you use 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 to the fuel.
In the
U.S. and Canada, it’s easy to be sure you get the right kind o\
f
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 91 for premium, 89 for middle grade
and
87 for regular. 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.
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Downloaded from www.Manualslib.com manuals search engine 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 th\
an 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.
Fuel that is more than
5% methanol is bad for your vehicle. Don’t use It.
It can corrode metal parts in your fuel system and also damage plastic
and rubber parts. That damage wouldn’t be covered under your\
warran
And even at 5% or less, there must be “cosolvents” md cc----6io
preventers in this fuel to help avoid these problems
Gasolines for CIeaner Air
Your use of gasoline with detergent additives will help prevent deposits fro\
m
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 ma\
terials,
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 g\
asoline.
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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