1998 CHEVROLET EXPRESS oil viscosity

Downloaded from www.Manualslib.com manuals search engine Have you recently changed brands of fuel?
If
so, be sure to fuel your vehicle with quality fuel (see
“Fuel” in the Index). Poor fuel quality will cause your
engine not to run as efficiently as designed. You may
notice this as stalling after start-up, stalling when you
put the vehicle into gear, misfiring, hesitation on
acceleration or stumbling on acceleration. (These
conditions may
go away once the engine is warmed up.)
This will be detected by the system and cause the light
to turn on.
If you experience one or more of these conditions,
change the fuel brand you use. It will require at least one
full tank
of the proper fuel to turn the light off.
If none of the above steps have made the light turn off,
have your dealer or qualified service center check the
vehicle. Your dealer has the proper test equipment and
diagnostic tools to fix any mechanical or electrical
problems that may have developed.
Oil Pressure Gage
The oil pressure gage
pressure in psi (pounds per
square inch) when the
shows the engine oil
8o I
engine is running. Canadian
vehicles indicate pressure in kPa (kilopascals).
OIL Wh
Oil pressure may vary with engine speed, outside
temperature and oil viscosity, but readings above the low pressure zone indicate the normal operating range.
A reading in the low pressure zone may be caused by a
dangerously low oil level or other problem causing low
oil pressure. Check your oil as soon as possible.
2-60

Downloaded from www.Manualslib.com manuals search engine Be sure to fill it enough to put the level somewhere in
the proper operating range. Push the dipstick all the way
back in when you’re through. RECOMMENDED SAE YlSCOSllY GRADE ENGINE OILS
FOR BEST FUEL ECONOMY AND COLD STARTING, SELECT THE LOWEST
SAE VISCOSITY GRADE
011 FOR THE EXPECTED TEMPERATURE RANGE.
What Kind of Engine Oil to Use
LOOK
FOR MIS atfi
SYMBOL
Oils recommended for your vehicle can be identified
by looking
for the “Starburst” symbol. This symbol
indicates that the oil has been certified by the American
Petroleum Institute (API).
Do not use any oil which
does not carry this Starburst symbol.
HOT
WEATHER
t
A
J I
I
1f you change your own
oil, be sure you use oil that
has the Starburst symbol
on the front of the oil
container.
If you have your
oil changed
for you, be sure
the oil put
into your engine
is American Petroleum
Institute certified for
gasoline engines.
.
SAt d-30 PREFERRED
COLD
WEATHER You should also use the proper viscosity oil for your
vehicle, as shown in the following chart:
DO NOT USE ME 20W.50 OR ANY OTHER GRADE OIL NOT RECOMMENDED I

Downloaded from www.Manualslib.com manuals search engine As shown in the 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. Do not use
other viscosity oils, such as
SAE 20W-50.
NOTICE:
Use only engine oil with the American Petroleum
Institute Certified For Gasoline Engines "Starburst" symbol. Failure to use the
recommended oil can result in engine damage not covered by your warranty.
GM Goodwrench@ oil meets all the requirements for
your vehicle.
If you are in an area where the temperature falls
below -20°F
(-29 "C), consider using either an
SAE 5W-30 synthetic oil or an SAE OW-30 oil. Both
will provide easier cold starting and better protection
for your engine at extremely low temperatures.
Engine Oil Additives
Don't add anything to your oil. Your dealer is ready to
advise if
you think something should be added.
When to Change Engine Oil
If any one of these is true for you, use the short tripkity
maintenance schedule:
Most trips are less than 5 to 10 miles (8 to 16 km).
This is particularly important when outside
temperatures are below freezing.
Most trips include extensive idling (such as frequent
driving
in stop-and-go traffic).
Most trips are through dusty areas.
You frequently tow a trailer or use a carrier on top of
The vehicle is used for delivery service, police, taxi
your
vehicle.
or other commercial application.
Driving under these conditions causes engine oil
to
break down sooner. If any one of these is true for your
vehicle,
then you need to change your oil and filter
every
3,000 miles (5 000 km) or 3 months -- whichever
occurs first.

Downloaded from www.Manualslib.com manuals search engine Part D: Recommended Fluids
and Lubricants
NOTE: Fluids and lubricants identified below by name,
part number or specification may be obtained from
your dealer.
USAGE
Engine Oil
(Gasoline
Engine)
Engine Coolant
FLUIDLUBRICANT
Engine Oil with the American
Petroleum Institute Certified For Gasoline Engines “Starburst”
symbol of the proper viscosity. To
determine the preferred viscosity
for your vehicle’s engine, see
“Engine Oil” in the Index.
50/50 mixture of clean water
(preferably distilled) and use only
GM Goodwrench@ DEX-COOL@
or Havoline@ DEX-COOL@
Coolant. See “Engine Coolant”
in
the Index.
USAGE FLUIDLUBRICANT
Hydraulic Brake Delco Supreme 11 @ Brake Fluid
System
(GM Part No. 12377967 or
equivalent DOT-3 Brake Fluid).
Parking Brake Chassis Lubricant (GM Part
Cable Guides
No. 12377985 or equivalent) or
lubricant meeting requirements
of NLGI ## 2, Category LB
or GC-LB.
Power Steering GM
Power Steering Fluid
(GM
System Part No. 1052884 - 1 pint,
Automatic DEXRON@-I11
Automatic
Transmission Transmission
Fluid.
Key Lock Multi-Pu
ose Lubricant,
Cylinders Superlube
% (GM Part
1050017
- 1 quart, or equivalent).
No. 1234624 1 or equivalent).
7-44