CHEVROLET CORVETTE 1993 4.G Owners Manual

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Engine Oil (CONI-.)
To Check Engine Oil:
Pull out the dipstick and clean it with a
paper towel or a cloth, then push it back
in all the way. Remove it again, Beeping
the
tip lower.
LTI Engine: Checking Engine Oil
L15
Engine: Checking Engine Oil
When to Add Oil:
*If the oil is at or below the ADD line,
you'll need to
add some oil.. But you
must use the right kind. This section
explains what kind of ail.to use. For
crankcase capacity, see the Index under
Capacities and Specifications.

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Just fill it enough to put' the level
Somewhere in the proper operating
parge-. Push the dipstick all the-way
back in when you're. through.
Your vehic1.e has- a LOW OIL light-on
the Driver InfomaAion Center that
canes on and stays on if your oil. is '/z to
1% quarts low (see t-he Index tilid&
Low Oil Ljght). Do not wait until this
light comes on to check your oil level.
This light is an added reminder
only-you should check your oil level
regularly.
LT1 Engine: Adding .Engine, Oil
CT5 Engine: Adding Engine Oil
What Kind of Oil To Use
'Lo& fcrr Three Things:
GM4718M
Your Corvette engine requires a
special. oil me,et&g GM Standard
GM4718M. Oils meeting this
Standard may be identified as
synthetic,
and should also. be
identified as API Service SG.
However, not all SynthetkAPI
Service SG oils will meet this GM
Standard. You should lo& for and
use only an .oil that meets GM
Stand;ird GM4718M.
25 I

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SAE 5w-30
As shown in the viscosity chart, SAE
5W-30 is best for your vehicle.
However,
you can use SAE 1OW-30 if
it’s going to be 0°F (-18°C) or above.
These numbers on an oil container
show its viscosity, or thickness.
Energy Conserving I1
Oils with these words on the
, container will help you save fuel.
This doughnut-shaped logo (symbol) is
used on most oil containers to ,help you
select the correct oil.
You should look for this on the oil
container, and use only those oils that
display the logo.
Your Corvette engine is filled at the
factory with a Mobil l@ synthetic oil,
which meets all requirements for your
vehicle.
= 252

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Substitute Oil (LTI Engine Only)
When adding .oil to maintain engine oil
level, if an oil meeting GM St.aidard
GM4718M is not available, you can use
oil designated either SAE 5W-30 API
Service SG at all temperatures, or SAE
1OW-30 API Service SC at temperatures
above
0°F (-18°C) : This oil should not
be used for an oil change.
Substitute. 01 (LTS Engine Only)
When adding oil to maintain engine oil
level,
if an oil meeting GM Standard
GM4718M is not available, you can use
oil designated. SAE 1OW-30 API Service
SG at all temperatures. This oil should
not be used for an oil change.
Engine 0il.Addifives
Don't add anything to your oil.>Your
Chemolet dealer is ready to
ad a ,'se if
you think something should be ,added. I
When to Change Engine Oil
See if my one of these is true !€or-you:
Most trips are less than 4 miles
(6 lm).
It's below freezing outside and most
trips are less than
10 miles (16 km) .
TEie engine is at low speed most of the
time
(as in stop-and-go traEc).
Most trips are through dusty places.
If any one of these is true for your
vehicle, you need to change
your oil
and filter every 3,000 miles
(5 000 km) or 3 months-whichever
comes first. (See
the Index under
Engine Oil Life Monitor.)
If none of them.is true, change the oil
every 7,500 miles (12 500 lun) or 12
months-whichever comes first.
Change the filter
at the first oil change
and
at every other oil change after that.
(See the Index under Engine Oil Life
Monitor.)

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Sevvice & Appearance Care
Engine Block Heater
(LTl ENGINE, CANADA ONLY)
An engine block heater can be a big
help if you have to park outside in very
cold weather, 0°F (-18°C) or colder. If
your vehicle has an engine block heater,
see the index under Engine Block
Heater.
154
What to Do with Used, Oil Air Cleaner
A
Used engine- oil contains.
things that have caused skin ..
,cancer in laboratory animals. Don't
let used oil stay.on your .skin for
very long. Clean you skin and nails
with soap and water, or a good
hand cleaner. Wash or properly
throw away ciuthing or rags
containing used
engine oil.
Refer to the Maintenance Schedule to
determine when
to replace the air filter.
Used
oil can be a real threat to the
environment. If you change your own
oil, be sure to drain all free-flowing oil
from the filter before disposal. Don't
ever dispose of oil by pouring it on the
ground, into sewers, or into streams or
bodies
of water. Instead, recycle it by
taking it to a place that collects used oil.
If you have a problem properly
disposing
of yo-ur used oil, ask your:
dealer, a service station or a local
recycling center €or
help.
L
;ee the Index under Scheduled
taintmame. Services.
I
CAUTION I

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2.. Pull -the manifold forward arid up-
3. Pull off -the cover -and removethe
4. Reverse steps -1-3 to reas-semble.
filter.
Make sure-the
short hob is returned
to the center position when you are
.-t
- finished. -- I.-, . ..E%. ,

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I vice &..Appearance Care
z 'A
Throttle Cable Adjusters
Your 1993 Corvette is equipped with
special throttle cable :adjusters.
If you
need-
to adjust the throttle. on your
engine; please see a qualified Chevrolet
,dealer or. refer to the 1993 Corvette-
Service Manual.
256
Automatic Transmission Fluid
When to Check and Change:
A good time to check your automatic
transmission fluid level is when the
engine oil is changed. Refer to the
Mairitenance Schedule-to determine.
when,to change.your fluid. See the
Index under Scheduled Maintenance
Seruices .
How to Check:
Because this operation can be a little
d-#icuft, you. may choose to have :this
dorie at .a Chevrolet dealership Sejrvice
If you do it yourself, be sure. to follow all
the instructions here, or. you could get a
false zeading on the dipstick.
Dt?p,ElI-tment..

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Wait at least 38 minutes .before
checking the transmission fluid level if
you have
been driving:.
When outside temperatures ae above
At high speed for qui-tte a while.
In heavy traffic-especially in hot
To get -the right reading, the fluid
should be at normal op-erating
temperature, which
is 180°F to 200°F
(82OC to 93'C).
90°F (32OC).
we-ather.
To Check T-ransmission Fluid Hot:
Get4he vehicle warmed.:up by driving
abaut 15 miles. (24 h) when outside
temperatures are ab.ove 50°F ( 10OC). If
it's colder than 5OoF (lOC), drive the
vehicle in D (third-gear) until the
engine temperature gage.moves and.
then-remains steady for ten minutes.
Thenfollow the procedures under To
Check the Eluid Hot or Cold.

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Automatic Transmission Fluid
(C.ONT.)
To Check Trafisinission Fluid Cold:.
A cold check is made after the-vehicle
has been sitting for eight hours-or miore
with. the engine offand is used only as :a
feference. Let the,engine run at idle for
five minutes if &utside temper&n%:_s are
50QF (10%) or-mare. If it's colder than
5QoF [lUaC), you may have-to idle the
engine longgr; A hat check must follou7
wheaffuid. is added dw"lqg a cold.check.
To Check the Fluid Hot or Cold
Park your vehicle- on: a- level place.
Place the ;shift lever in P (Park) with
With your foot on the brake pedal,
the .parkingbrake applied.
mave the shift lever through each gear
range, pausing for about three
seconds in each range. Then, p-asition
the-s-hift'lever in P (Park).
minutes ,or more;
Let the engine rd .at idle for three
Then, Without Shutting Off the
Engine, Follow- These Steps:
1. Pull out the dipstick and wipe it with
a
clean rag or paper towel.
2. Push it back in all the. way, wait three
seconds and then pull; h back out
again.
3. Check b.& stdes af the dipstick, and
read the
loweg. limd. The hid he1
must be in the COLD area for a cold
checkor in th-e HOT or er0s.s-
hatched area for a hat checl<.
4. If the fluid level is whe$e it should. be,
push the dipstick b:ack in all the way.

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c How to Add Fluid:
Refer to the Maintenance Schedule to
determine
what kind oftransmission
fluiil to use. See the Index under Fluids.
G Lubricants.
If the fluid level is low, add only enough
of the proper fluid to bring. the level up
to the COLD area.for a cold-check or
the-HQT
area for a-.hot ‘check. It
doesn’t take much fluid, generally legs
than a pint. Don’t overfill. We
recommend
you use only fluid IabeIed
DEXRON@-JIE, because fluids with that
label are made especially
for your
automatic transmission.. Damage caused
by fluid other than DEXXO-Nq-IIE is not
covtir,ed by your-new vehicle warranty.
After adding fluid, recheck the fluid
level as described under How to Check.
When the correct fluid level is obtained,
push
the dipstick back in all the way.
Manual Transmission Fluid
When to Check
A good time to have it checked is when
the
engine oil is changed. Howevw, tbe
fluid in your-manual transmission
doesn’t require-changing.
How to Check:
Becguse this operation can be a iittie
difficult,
you may choose to-have this
done at a Chevrolet dealership Service
Department.
If you do it y.Ourself, be sure to follow
all the instrvctiuns here, or you could
get a false reading.