1995 Cadillac Fleetwood Owner's Manual - Page 219

Your vehicle has anair bag system. Before attempting to do your own service work, see "Servicing Your Air Bag-Equipped Cadillac" in the Index. Fuel Use regular unleaded gasolinerated at 87 octane or higher. At a minimum, it should meet specifications ASTM D4814 i the United States and CGSB 3.5-M93 n in Canada. Improved gasoline specifications have been developed by the American Automobile Manufacturers Association (AAMA) €or better vehicle performance and engine protection. Gasolines meeting theAAMA specification could provide improved driveability and emission control system protection compared to other gasolines. Be sure the posted octane is atleast 87. If the octane is less than 87, you may get a heavy knocking noise when you drive. If it's badenough, it candamage your engine. You should keep a record with parts receipts andlist all the mileage and the date of any service work you perform. See "Maintenance Record" in the Index. You can beinjured andyour vehicle could be a damaged if you try to do service work on vehicle without knowing enough about it. 0 Be sure you have sufficient knowledge, experience, and the properreplacement parts andtools before you attempt any vehicle maintenance task. 0 Be sure to use the proper nuts, bolts and other fasteners. "English"and "metric" fasteners can be easily confused. you use If the wrong fasteners, parts can later break or fall off. You could behurt. If you're using fuel rated at 87 octane or higher and you still hear heavy knocking, your engine needs service. But don't worry if you hear a little pingingnoise when you're accelerating or drivingup a hill. That's normal, and you don't have to buy higher octane fuel to get rid a of pinging. It's the heavy, constant knock thatmeans you have a problem. 6-2