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FUEL REQUIREMENTS
(Gooline
EngInes>.
"
If
your vehticle has .a
~
«900.
see
the
"Diesel,
EngirMf'
inIor",""lion.
in
Sections2.and5ofthis~~
,_
~
"
"
-
."
.,.
Yf» gasohl
engine"
is desigoecHo
'uSe
only
unleaded,
gasoline.
UnIeaded
-
gasoline
rrust·
be
used
for
the
emission
control
~
'to·
operate
properly:
Its
use
will
also
reduce
spartI;
pl!J9JouJing.
exhaust
system",corrosion
and
e:ngine
oil
deterioratiOO.
. '
,
,
.
,
.
"
USiI'IQ leaded gasoline
.carV-damage the
emission .COOlrolsystem and
could
result
in loss
cit
emission
warranty
coveJage.
The
.etffpivenes'
s of
the
cata/¢.
In the cata.lytic
oonverter
c;iea:"eases after
~\01
a!!!
linle
as
one'
tank
01
~
gasoline.
Also,
.
your
vehicle
may:
~ve)OO
..
~
CorprnMd
Control"
system,
which
includes
an
oxygen. ,
s
ensor.
I.~
g~n8
,will
~
the
~nsor:.
and
det~iQrate
emission CQI'ltfol
..
(For
.
more
infor~tion.
See
.
"Computer CommSnQ
Coo1(oi
System:' in
"
Service
and Maintenance,"
S9!rtion
:
5
of
this
manual),
.,.
':
. . .
.
'
.. '
FederaJ
re9uttitions
'
r
eQuire
ItW
,~mPs
~iverlng ~g~
tie
Labeled
with
the
word
VNLEAdEo.
Only
theSe
:~'
hav,
a
noZzm
which
til
~
-
filier
neck
of
yoUr
vehiCle'S
gasOline
lank.
-.
,.,
;:
-,
"
In
the
United.
Stat~,
Federal
.1aw
aJsci
r~.
e s
that
gasoh
~
ratings
be
'posted on
the
-pumps.
The octane
rating shown is an
av~
of
Research
octane (Rf
and Motor octane (M).
In
most parts of
the
United
Stat~,
.•
you
shoUld use 'unleaded 'gasoline
with
an octant:! rating ·o'at least
$7.
However;
you ·may use
unleaded
gasoline
w.
i th an
·octane·
rating
as
·
low as 85 In
these
hlgh-altitUcte···
ateas:
Colorado,
Montana.,
··
New
·Mexioo;
utah, Wyoming.
northeastern
Nevada,
8QlIthern
Idaho,
western
South
Dakota,
and
that
part
..
of
Texes
wt:IiCh
is
directly south of
New
Mexico.
'
'
.
USing
urieaded
gasoine willi an
octane
ratfng
lower
than stated above
can
cause
wsistenl,
hea,I/Y
I~~
knock."
("Spar.k ~'
.is
a
metallic rawiog
.
noise.)
.
If
·
~e,
this
Car)
~
to
~
damage.
lI'yOU
de!:ect
~vy spar~
knock·
evenwhen
,using
gasoline
of
the
recomme:ncted
octane
raling; ",o~
If
yru
hear
steady
spark
knOck while
holding
a 'steady 'speed
on levet
roads,
have
your dealer
COffect
the
I?r~;
Faihjr~
to,Jake
steps}:"
stop ~
knocking
is
misuse of
the vehicle,
tor
which
Chevrolet
Is
not
re5JXlllSibie.
However,
now
and
then
you
may notice
light
spn:
·knock
lOr
a shonlime 'whlle
aooeIeratinQ'
or
diving up
hills.
This
is
no cause-for conoom. becEM'S8 you get the
greatest
fuel
economy
benefl
from'
the
~'$
octane
rating
when
there is
occasional-light·
spar1I:
knOck.
Using gasoline
with"
a
-higher
,
o ctane
rating
-
tt\M
that
whlch'slI6ws
occ'Uionai
spartI:
kI)OCk
is an unnecessary
expense.
,
..
"
"
.'
;
-
."
,
"
"
..
.
GuoI>OI
.·
Gasohol,
a mixlLKe of unleaded
gasoine
and
ethanol (grain
aloohol),
is
available
in
some
a"eas.
You may.use
gasohol in
'fOOl
-vehicle.
if it
is
no more
than
"10%
ethanof.
Be
sure
the
gasohol has
OCiane ratingS'no 6ow9r
than
those
recommended
for:.
unteaded
gasoine.
Most
drivefs will not notice operating
differences
with
gasohol,
bUt
,some
_
may.
IQ that
case~
your authorized dealer
can make certain adJustments,
proVided
'they 'do not
violate
the'
Federal
EmissiOn
$andaidS.
If
you are still
not satiSfied
with-gasohol perkifmance, .you
may prefer
to
use unleaded
gasOline."
:.\
. '
,
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