Chevrolet 1994 Blazer Owner's Manual page 247

You should also use the proper viscosity oil for your vehicle, as shown in
the following chart:
RECOMMENDED SAE VISCOSITY GRADE ENGINE OILS
FOR BEST FUEL ECONOMY AND COLD STARTING, SELECT THE LOWEST
SAL VISCOSITY GRADE 011 FOR THE EXPECTED TEMPERATURE RANGE.
HOT
WEATHER
[
+ 60
+
40
f
20
I
C
-
+ 3 8
-
+ 2 7
-
+ 1 6
- + 4
-
- 7
-
- 1 8
COLD
WEATHER
SAE 5W-30
PREFERRED
LOOK FOR
ONE OF THESE
LABELS
SAE 1OW-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 5W-30 is best for your vehicle. However, you
can use SAE low-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 1OW-40 or SAE 20W-50.
If you cannot find oils with the new "starburst" symbol on the front of the
container, you should look for and use oils containing the following three
things:
6-11