GMC 1994 Yukon Owner's Manual page 265

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
"F
tlOO
-
+EO
-
+ 6 0
-
+ 4 0
-
+20
-
-
COLD
7
"C
-
+38
-
+27
-
+16
- + 4
- - 7
.-18
I
WEATHER
I
I
€-
SAE 5W-30
LOOK FOR
ONE OF THESE
LABELS
I-
SAE
T
1OW-30
PREFERRED
above 0°F
(-1 8%)
IF NEITHER SAE 5W-30 NOR SAE 1OW-30
GRADE OILS ARE AVAILABLE, SA€ 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 IOW-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 IOW-40 or SAE 20W-50.
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