Owner's Manual
Page 243
...such fuels are not available in the Index. If this occurs, return to your authorized Chevrolet dealer for diagnosis to determine the cause of pinging. In the event it can damage your engine. If it's bad enough, it is determined that meet California Emission Standards (indicated on ... octane is the type of fuels used, repairs may not be affected. If the octane is designed to get a heavy knocking noise when you hear heavy knocking, your engine needs service. If you 're accelerating or driving up a hill. See "Malfunction Indicator Lamp" in states adopting California emissions...
...such fuels are not available in the Index. If this occurs, return to your authorized Chevrolet dealer for diagnosis to determine the cause of pinging. In the event it can damage your engine. If it's bad enough, it is determined that meet California Emission Standards (indicated on ... octane is the type of fuels used, repairs may not be affected. If the octane is designed to get a heavy knocking noise when you hear heavy knocking, your engine needs service. If you 're accelerating or driving up a hill. See "Malfunction Indicator Lamp" in states adopting California emissions...