1996 Chevrolet Suburban Owner's Manual - Page 300
1996 Chevrolet Suburban Manual
Page 300 highlights
DIESEL ENGINES I RECOMMENDED SAE VISCOSITY 6RADE ENGINE OILS SELECT THE SAE ORADE OIL BASED O N THE EXPECTED TEMPERATURE RANGE BEFORE NEXT 011 CHANGE HOT WEATHER +100 /OF -- + +32 -+BO 0 -20 9 c - +38 18 -SA€ 30 SAE 15W-40 PREFERRED above 0°F (- 18°C) I SA€ 1OW-30 COLD WEATHER DO NOT USE SAE 2OW-50 OR ANY OTHER GRADE OIL NOT RECOMMENDED SAE 15W-40 As shown in the viscosity chart, SAE 15W-40 is best for your vehicle. However, you can use SAE 1OW-30 if it's going to be colder than 32°F (0OC) before your next oil change. When it's very cold, below 0°F (-1 8OC), you should use SAE 1OW-30 to improve cold starting. Also, SAE 30 may be used at temperatures above freezing, 32°F (OOC). These numbers on the oil container show its viscosity, or thickness. Do not use other viscosity oils such as SAE IOW-40 or SAE 2OW-50. 6-23