1998 Cadillac Eldorado Owner's Manual - Page 283

A CAUTION: You can be injured and your vehicle could be damaged if you try to do service work on a vehicle without knowing enough about it. 0 Be sure you have sufficient knowledge, experience, the proper replacement parts and tools before you 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 be hurt. Fuel Use premium unleaded gasoline rated at 91 octane or higher for best performance. You may use middle grade or regularunleaded 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 specification could provide improved driveability and emission control system protection Fompared to other gasolines. Be sure the posted octane for premium is at least 9 1 (at least 89 for middle grade and 87 for regular).If the octane is lessthan 87, you may get a heavy knocking noise when you drive. If it's bad enough, it can damage your engine. If you're using fuel rated at the recommended octane or higher and you hear heavy knocking, your engine needs service. But don't worry if you hear a little pinging noise when you're acceleratingor driving up a hill. That's normal, and you don't have to buy a higher Adding Equipmentto the Outside of Your Vehicle Things you might add to the outside of your vehicle can affect the airflow around it. This may cause wind noise and affect windshield washer performance. Check with your dealer before adding equipment to the outsideof your vehicle. 6-3