1993 Chevrolet Camaro Owner's Manual - Page 223

NOTICE: Fuel The 8th digit of your Vehicle Identification Number (VIN) shows the code letter for your engine. You will find the VIN at the top leftof your instrument panel. (See "Vehicle Identification Number" in the Index.) 3.4L L32 (Code S) Use regular unleaded gasoline rated at 87 octane or higher. It should meet specifications ASTM D4814 in the U.S. and CGSB 3.5-92 in Canada. These fuels should have the proper additives, so you should not have to add anything to the fuel. In the U.S. and Canada, it's easy to be sure you get the right kind of gasoline (unleaded). You'll see UNLEADED right In the pump. And only unleaded nozzles will fit into your vehicle's filler neck. B sure the posted octane is at least 87. e :f the octane is less than 87, you may get sl heavy knocking noise when youdrive. If it's bad enough, it can damage your engine. If you're using fuel rated at 87 octane or higher and youstill hear heavy knocking, your engine needs service. But don't worry if you hear a little pinging noise when you're accelerating or driving up a hill. That's normal, and you don't have to buy a higher octane fuel to get rid of pinging. It's the heavy, constant knock that means you have a problem.