1993 Oldsmobile Silhouette Owner's Manual - Page 230

Service & Appearance Care necommenueu ~ A vlsr;osny C Grade Engine Oils For best fuel economy and cold starting, select thelowest SAE viscosity grade oil for the expected temperature range. I HOT YEATHER What Kind of Oil to Use (CONI) SAE 1OW-30 (3800 V6 Engine) As shown in the viscosity chart, SAE 1OW-30 is best for your vehicle. However, you can use SAE 5W-30 if it's going tobe colder than 60°F (16°C) before your next oil change. When it's very cold, below 0°F (-18" C), you should useSAE 5W-30. These numbers onan oil container show its viscosity, or thickness. Do not use other viscosity oils such as SAE 1OW-40 or SAE 20W-50. Energy ConservingII Oils with these words on container the will help you save fuel. This doughnut-shaped logo (symbol) is used on most oil containers tohelp you select the correct oil. You should look for this on the oil container, and useonly those oils that display the logo. GM Goodwrench@ (in Canada, GM Oil Engine Oil) meets all the requirements for your vehicle. . _._ SAE 5W-30 COLD N EATHER GRADE OILS ARE AVAILABLE, S GRADE MAY BE USED AT TEMP ABOVE 40 DEGREES F (4 DEGREE DO NOT USE SAE 1OW-40, SAE 20W- 228