1998 Pontiac Firebird Owner's Manual - Page 256

Fuel You can be injured and your vehicle could be damaged if you try to doservice work on a vehicle without knowing enough about it. 0 Be sure you have sufficientknowledge, experience, theproper replacement parts and tools before you attempt anyvehicle maintenance task. 0 Be sure touse the propernuts, boltsand other fasteners. "English"and '5netric" fasteners canbe easily confused. If you use the wrong fasteners, parts can later break or fall off. You could be hurt. The 8th digitof your vehicle identification number (VIN) showsthe code letter for your engine.You will find the VINat the top left your instrument panel. of (See "Vehicle Identification Number" the Index.) in Adding Equipment to theOutside of Your Vehicle Things you might add to outside of your vehicle can the affect theairflow around it.This may cause wind noise and affect windshieldwasher performance. Check with your dealer before adding equipmentthe outsideof to your vehicle. If you have the3800 engine (VIN Code K), use regular unleaded gasoline rated at octane or higher. 87 If you have the5.7L engine (VIN Code G), use premium unleaded gasoline rated 91 octane or at higher for best performance.You may use middle grade or regular unleaded gasolines, but your vehicle may not accelerate as well. At a minimum, the gasoline you use should meet specifications ASTM D48 14 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 vehicleperformance and engine protection. Gasolines meeting the AAMA specification could provide improved driveability emission control and system protection compared to other gasolines. 6-3