1993 GMC Suburban Owner's Manual - Page 280

- 16 -4 -7 - 18 srae low-30 PREFERRED above 0°F (-18°C) SA€ BW-30 COLD WEATHER IF NEITHER SAE 5W-30 NOR SAE 10W-30 GRADE OILS ARE AVAILABLE, SAE 30 GRADE MAY BE USED AT TEMPERAfURES M O V E 48 DEGREES F (4 DEGREES C). DO NOT USE M E 1OW-40, SAE 2BW-50 OR ANY OTHER GRADE OIL NOT RECOMMENDED Vehicles with Heavy Duty Emissions (8501 GVWW or mere). As shownin thischart, SAE 1OW-30 isbest for your vehicle. However, you can use SAE 5W-38 if it'sgoing to becolder than 60°F (16°C) beforeyournext oil change,When it's verycold,below should use §A€ 5W-30. 6-1 4 0°F (-18°C)' you