GMC SIERRA 1994 Manual page 271

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
O C
+ l o o
-
-
+3a
+80
- -
+27
+ 6 0 - - + 1 6
+ 4 0 - - + 4
+ 2 0 - - - 7
0 - - - 1 8
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 OI L 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.
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