1997 Cadillac Catera Owner's Manual - Page 246

Fuel You can be injured and your vehicle could be damaged if you try to do service work on a vehicle without knowing enoughabout it. Be sure you have sufficient knowledge, experience, the properreplacement parts and tools beforeyou attempt any vehicle maintenance task. Be sure to use the proper nuts, bolts and other fasteners. "English" and ('metric" fasteners can be easily confused.If you use the wrong fasteners, parts can later break or fall off. You could behurt. Use premium unleaded gasoline rated at 91octane or higher for best performance. You may use middlegrade or regular unleaded gasolines, but your vehicle may not accelerate as well. At a minimum, the gasoline you use should meet specifications ASTM D4814 in the United States and CGSB 3.5-M93 in Canada. Improved gasoline specifications have been developed by the American Automobile Manufacturers Association (AAMA) for better vehicle performance and engine protection. Gasolines meeting the AAMA specificationcould provide improved driveability and emission control system protection compared to other gasolines. Be sure the posted octane for premium is at least 91 (at least 89 for middle grade and 87 for regular). If the octane is 1ess.than 87, you may get a heavy knocking noise when you drive. If it's bad enough, it can damage your engine. Adding Equipment to the Outside of Your Vehicle Things you might add to the outsideof your vehicle can affect the airflow around it. This may cause wind noise and affect windshield washer performance. Check with your Cateradealer before adding equipment to the outside of your vehicle. 6-3