1994 Chevrolet Suburban Owner's Manual - Page 264

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 "C LOOK FOR ONE OF THESE LABELS +loo - - +38 - - +16 I +80 - - + 2 7 +60 t40--+4 +20 - - - I 0 - --18 I SAE 1OW-30 PREFERRED SAE 5W-30 COLD WEATHER 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). DO NOT USE SA€ 1OW-40, SAE 2OW-50 OR ANY OTHER GRADE OIL NOT RECOMMENDED 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 containershow its viscosity, or thickness. Do not use other viscosity oils, such as SAE lOW-40 or SAE 20W-50, 6-19