1994 Chevrolet S10 Pickup Owner's Manual - Page 230

I you cannot find oils with the "starburst" symbol on the of the f new front container, you should lookfor and use oils containing the following three things: SHor SG "SH orSG" must be on oil container,either by itself or combined the with other quality designations, such as "SWCD," SG, CD," "SH, "SG/CD,"etc. These letters show American Petroleum Institute (API) levels of quality. 0 SAE 5W-30 Energy Conserving I1 Oils with these words on the container will help you save fuel. These three things are usually included in a doughnut shaped logo (symbol) on most containers.If you cannot find oils with the "starburst" symbol, you should look for oils with the doughnut shaped symbol, containing the three things noted above. NOTICE: If you use oils that do not have either the "starburst" symbol or an API SH or SG designation, you can cause engine damage not covered by your warranty. GM Goodwrench@ oil (in Canada, Engine Oil) meets all the GM requirements for your vehicle. 6- 12