GMC 1993 Suburban Owner's Manual page 279

. . I
SAE 1OW-30
SAE 5W-30
PREFERRED
IF NEITHER SAE 5W-30 NOR SA€ IOW-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 low-40, SAE 2OW-58 OR
PO344
e
SAE 5W-30
Vehicles with bight Duty Emissions (8500 GVWR
or less).
As shown in this chart, §BE 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.
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