1993 Chevrolet Camaro Owner's Manual - Page 224

Service & Appearance Care Be sure the posted octane for premiumis Use premium unleaded gasoline rated at least 91 (at least89 for middle grade at 91 octaneor higher. You may use middle and 87 for regular).If the octaneis less grade or regular unleaded gasolines, but than 87,you may geta heavy knocking noise when you drive. If it's bad enough, your vehicle may not accelerate well. as it can damage your engine. The gasoline you use should meet specifications ASTM D48 14 in the U.S. If you're using fuel rated at 91 octane or and CGSB 3.5-92 in Canada. These fuels higher and you still hear heavy knocking, should have the proper additives, you your engine needs service. But don't so should not have to add anything to the worry if you heara little pinging noise when you're acceleratingor driving up a fuel. hill. That's normal and you don't have to In the U.S. and Canada, it's easyto be sure you get the right kind of gasoline buy a higher octane fuel to get rid of (unleaded). You'll seeUNLEADED right pinging. It's the heavy, constant knock on the pump. And only unleaded nozzles that means you havea problem. will fit into your vehicle's filler neck. = 5 7 LT1 (Code P) .L All Engines What about gasoline with blending materials that contain oxygen, such as MTBE or alcohol? MTBE is "methyl tertiary-butyl ether." Fuel that is no more than 15% MTBE is fine for your vehicle. Ethanol is ethylor grain alcohol. Properly-blended fuel that is no more than 10% ethanol is fine for your vehicle. 220