1994 GMC SIERRA oil viscosity

NOTICE:
After you’ve used the coolant heater, be sure to store the cord in
the manner it was, to help keep it away from moving engine
parts.
If you don’t, it could be torn and damaged.
How long should you keep the coolant heater plugged in? The answer
depends on the weather,
the kind of oil you have, and some other things.
Follow this chart.
Engine Coolant Heater Usage
Viscosity/ 32°F
to 0°F
Oil Grade
(OOC to -1SOC)
SAE
1 OW-30
SAE
I5W-40
Not
Required
Not
Required
0°F to -10°F
(-18” C to -23 O C)
Two
Hours*
Two
Hours*
Below -10°F
Below -23 ” C
Eight Hours* or Overnight
Eight Hours”: or Overnight
*The times listed are minimum times. It
will not harm either the coolant
heater or the vehicle
to leave the coolant heater plugged in longer than the
times stated.
For best results
in cold weather, use Number I-D diesel fuel or a
“winterized” Number 2-D fuel.
lf Your Diesel Engine Won’t Start
If you’ve run out of fuel, look at “Running Out of Fuel” (see “Diesel Fuel
Requirements and Fuel System” in the Index).
If you’re not out of fuel, and your engine won’t start, do this:
Turn your ignition key to RUN. Make sure that the “GLOW PLUGS” light
is out. Then turn the ignition key to START.
If the light doesn’t go off, wait a few seconds, then try starting your engine
again. And, see
your dealer as soon as you can for a starting system check.
2- 18
ProCarManuals.com

Oil Pressure Gage
Standard Cluster -Gas Standard Cluster -Diesel
30
I
Tachometer Cluster -Gas Tachometer Cluster -Diesel
The oil pressure gage shows the engine oil pressure in psi (pounds per
square inch) when the engine
is running. Canadian vehicles indicate
pressure
in kPa (kilopascals). Oil pressure may vary with engine speed,
outside temperature and
oil viscosity, but readings above the low pressure
zone indicate the normal operating range.
2- 80
ProCarManuals.com

You should also use the proper viscosity oil for your vehicle, as shown in
the following chart:
LIGHT DUTY EMISSIONS -GAS ENGINES
RECOMMENDED SAE VISCOSITY GRADE ENGINE OILS
FOR BEST FUEL ECONOMY AND COLD STARTING, SELECT THE LOWEST
SAE VISCOSITY GRADE OIL
FOR THE EXPECTED TEMPERATURE RANGE.
HOT
WEATHER
F
tlOO -
+80 -
+60 -
+40 -
+20 -
0-
C
t 38
t 27
t 16
t4
-7
- 18
m LOOK
ONE OF THESE
LABELS
-- -1 -I SAE 1OW-30
IF NEITHER SAE 5W-30 NOR SAE 1OW-30
5w-30 GRADE OILS ARE AVAILABLE, SAE 30
PREFERRED GRADE MAY BE USED AT TEMPERATURES
ABOVE
40 DEGREES F (4 DEGREES C).
DO NOT USE SAE 1OW-40, SAE 2OW-50 OR
ANY OTHER GRADE OIL NOT RECOMMENDED
As shown in the chart, SAE SW-30 is best for your vehicle. However, you
can use SAE 1OW-30 if it’s going to be 0°F (-1 8°C) or above. These
numbers on an
oil container show its viscosity, or thickness. Do not use
other viscosity oils, such as SAE lOW-40 or SAE 20W-50.
6-20
ProCarManuals.com

HEAVY DUTY EMISSIONS -GAS ENGINES
RECOMMENDED SAE VISCOSITY GRADE ENGINE OILS
FOR BEST FUEL ECONOMY AND COLD STARTING, SELECT THE LOWEST
SAE VISCOSITY GRADE OIL
FOR THE EXPECTED TEMPERATURE RANGE.
HOT
WEATHER
m
“F OC
+loo - - +3a
+80 - - +27
+60 --+16
+40--+4
+20---7
0 ---18
I SAE
COLD
WEATHER
LOOK FOR
ONE OF THESE
LABELS
SAE 1OW-30
PREFERRED
above 0°F (-1 SOC)
~ 5W-30
IF NEITHER SAE 5W-30 NOR SAE 1OW-30
GRADE OILS ARE AVAILABLE, SAE 30
GRADE MAY BE USED AT TEMPERATURES
ABOVE
40 DEGREES F (4 DEGREES C).
ANY OTHER GRADE
OIL NOT RECOMMENDED
DO NOT USE SAE 1OW-40, SAE 2OW-50 OR
As shown in the chart, SAE 1OW-30 is best for your vehicle. However, you
can use
SAE 5W-30 if it’s going to be colder than 60°F (16°C) before your
next
oil change. When it’s very cold, you should use SAE 5W-30. These
numbers on an oil container
show its viscosity, or thickness. Do not use
other viscosity oils, such as
SAE low40 or SAE 20W-50.
6-21
ProCarManuals.com

DIESEL ENGINES
RECOMMENDHI SAE VISCOSITY GRADE ENGINE OILS
SELECT THE SAE GRADE OIL BASED ON
THE EXPECTED TEMPERATURE RANGE
BEFORE NEXT
OIL CHANGE
HOT
WEATHER
;F
k 100
+60 --+16
+32 -- 0
0 -- -18
-20 - -29
---I
---I SAE low*
SAE 15W-40
PREFERRED
above 0°F (- 18%)
830
I SAE r 30
COLD
WEATHER
DO NOT USE SAE 1OW-40, SAE 2OW-50 OR
ANY OTHER GRADE OIL NOT RECOMMENDED
SAE 15W-40
As shown in the viscosity chart, SAE 15W-40 is best for your vehicle.
However, you can use
SAE 1OW-30 if it’s going to be colder than
32°F (0°C) before your next oil change. When it’s very cold, below
0°F (-I 8OC), you should use SAE 1,0W-30 to improve cold starting.
Also, SAE 30 may be used at temperatures above freezing, 32°F (0°C).
These numbers on the oil container show its viscosity, or thickness. Do
not use other viscosity oils such as SAE 10W-40 or SAE 2OW-50.
4-27
ProCarManuals.com

Explanation Of Scheduled Mainienance Services
Below are explanations of the services listed in the maintenance charts.
The proper fluids and lubricants to use are listed in this section. Make sure
whoever services your vehicle uses these. All parts should be replaced and
all necessary repairs done before you or anyone else drives the vehicle.
1. ENGINE OIL AND OIL FILTER CHANGE“‘ - ALWAYS USE
SJ3 ENERGY CONSERVING I1 (GASOLINE ENGINE) OR CF-4/SH
(DIESEL ENGINE) QUALITY OILS
OF THE PROPER VISCOSITY.
To determine the preferred viscosity oil for your vehicle’s engine (e.g.
SAE 5W-30 or 10W-30), see “Engine Oil”
in the Index.
2. CHASSIS LUBRICATION - Lubricate the front suspension, king
pin bushings, steering linkage, transmission, and transfer case shift
linkage, parking brake cable guides, rear driveline center splines and
front axle propshaft splines, brake pedal springs, and clutch pedal
springs at the intervals specified.
If you have a 3500
HD, lubricate the king pins and king pin bushings,
every
1,500 miles (2500 km) for Maintenance Schedule I, or every
3,000 (5000 km) for Maintenance Schedule 11.
Ball joints and king pin bushings should not be lubricated unless their
temperature
is 10” F (-12”C), or higher. When the weather is cold, let
them warm up before lubrication or
they could be damaged.
Also, be sure
to check all the vehicle fluid levels at this time.
3.
CLUTCH FORK BALL STUD LUBRICATION (5-SPEED
MANUAL TRANSMISSION WITH DEEP LOW
) - Lubricate the
clutch fork ball stud through the fitting
on the clutch housing.
Lubricant must be added “sparingly” to
the fitting, as only .0066 lb.
(.003 kg) is required to lubricate the ball stud surface. Do not add
lubricant more often than the intervals
in the Maintenance Charts. Too
much lubricant will damage the clutch assembly.
4. COOLING SYSTEM SERVICE”’? - Drain, flush and refill system
with new coolant. See “Engine Coolant” in the Index for
the proper
coolant and mixture to use
in your vehicle.
Also inspect the hoses and replace them
if they are cracked, swollen, or
deteriorated. Tighten all hose clamps (except constant tension clamps).
Remove debris and clean the outside of the radiator and air
conditioning condenser. Wash the radiator neck.
To ensure proper
operation, pressure test.
the radiator and cap.
* An Emission Control Service
?A fluid
loss in these systems may indicate a problem. Have them
inspected and repaired at once.
7-18
ProCarManuals.com

Recommended Fluids & Lubricants
NOTE: Fluids and lubricants identified below by name, part number or
specification may be obtained from your GM Dealer.
USAGE
Engine Oil - Gasoline
Engines
Engine
Oil - Diesel Engines
Engine Coolant
Hydraulic Clutch System
Hydraulic Brake Systems
Parking Brake Cables
Power Steering System
Automatic Transmission
FLUIDLUBRICANT
API service SH or SG Energy
Conserving I1 oils
of the recommended
viscosity. The
“SH” designation may be
shown alone or
in combination with
others, such
as “SH/CD,” “SH, SG,
CD,”“SG/CD,” etc. To determine the
preferred viscosity for your vehicle’s
engine, see “Engine Oil” in the Index.
API service CF4SH. The
“CF4SH”
designation may be shown alone or in
combination
with others, such as
“CF-4/SG,” “CE/SH” or “CE/SG,” etc.
The designation may
also be listed in
reverse order, such
as “SH/CF-4.” To
determine the preferred viscosity for
your vehicle’s engine, see “Engine Oil”
in the Index.
Mixture
of water and a good quality
ethylene glycol base antifreeze
conforming
to “GM Specification
6038-M” (GM Part No. 1052753)’ or
approved recycled coolant conforming to
“GM Specification
603%”’ with a
complete coolant flush and refill.
Hydraulic Clutch Fluid (GM Part No.
I2345347 or equivalent).
Delco Supreme
11 @ brake fluid (GM
Part No.
1052535 or equivalent DOT-3
brake fluid).
Chassis Lubricant (GM Part No.
I2346003 or equivalent) or lubricant
meeting requirements of NLGI Grade
2,
Category LB or GC-LB.
GM Power Steering Fluid (GM Part
No. 1050017 or equivalent) conforming
to
“GM Specification 99850 10.”
DEXRON~ 111 or DEXRON~ IIE
Automatic Transmission Fluid.
7-26
ProCarManuals.com