1998 Pontiac Grand Am Owner's Manual - Page 236

A CAUTION: Fuel nl 87. Be sure the posted octane is at least If the octaneis less than 87, you may geta heavy knocking noise when you drive. If it's bad enough, it can damage your engine. If you're usingfuel rated at87 octane or higher and you hear heavy knocking, your engine needs service. But don't worry if you hear little pinging noise when a you're accelerating or driving uphill. That's normal, a Adding Equipment to the Outside of and you don't have to a higher octane fuel to get rid buy Your Vehicle of pinging. It'sthe heavy, constant knock that means Things you might add to the outside of your vehicle can you have a problem. it. affect the airflow around This may cause wind noise and affect windshield washer performance. Check with the outside of your dealer before adding equipment to your vehicle. You can beinjured and your vehicle could be damaged if you try to do service work on a vehicle without knowing enough about it. Be sure you have sufficient knowledge, experience, the proper replacement parts and tools before you attempt any vehicle maintenance task. 0 Be sure to use the proper nuts, bolts and and other fasteners. "English" "metric" If fasteners can be easily confused.you use the wrong fasteners, parts can later break or fall off. You could be hurt. Use regular unleaded gasoline rated 87 octane or at higher. At a minimum, should meet specifications it CGSB 3.5-M93 ASTM D4814 in the United States and in Canada. Improved gasoline specifications have been developed bythe American Automobile Manufacturers Association (AAMA)for better vehicle performance AAMA and engine protection. Gasolines meeting the specification could provide improved driveability and emission control system protection compared to other gasolines. 6-3