1993 GMC 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). DO NOT USE SAE low-40, SAE 2OW-58 OR ANY OTHER GRADE OIL NOT RECOMMENDED 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 tobe 0°F (-18°C) above. or 6-1 3