1995 Chevrolet Blazer Owner's Manual - Page 251
1995 Chevrolet Blazer Manual
Page 251 highlights
You should also use the proper viscosity oil your vehicle, as shown in for the following chart: RECOMMENDED SAE VISCOSITY GRADE ENGINE OILS FOR BEST FUEL ECONOMV AND COLD STARTING, SELECT THE LOWEST SAE VISCOSITY GRADE OIL FOR THE EXPECTED TEMPERATURE RANGE. HOT WEATHER F t 100 LOOK FOR THIS SYMBOL C + 38 + 80 + 27 + 16 +4 + 60 + 40 + 20 0 -7 - 18 -I . I I SAE low-30 SAE 5W-30 PREFERRED 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) I COLD WEATHER DO NOT USE SAE 1OW-40, SAE 2OW-50 OR ANY OTHER GRADE OIL NOT RECOMMENDED As shown in thechart, SAE 5W-30 is best for your vehicle. However, you can use S A E 1OW-30 if it's going to be 0°F (-18°C) above. These or numbers on an oil container show its viscosity, thickness. Do not use or other viscosity oils, such asS A E 20W-50. 6-11