1996 Chevrolet Express Van Owner's Manual - Page 230

Your vehicle may have an air bag system. If it does, see "Servicing Your Air Bag-Equipped Vehicle" in the Index before attempting to do your own service work. Fuel (Gasoline Engine) If your vehicle has a diesel engine, see "Diesel Fuel Requirements and Fuel System" in the Diesel Engine Supplement. For vehicles with gasoline engines, please read this. Use regular unleaded gasoline rated at 87 octane or higher. At a minimum, it 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 vehicle performance and engine protection. Gasolines meeting the AAMA specification could provide improved driveability and emission control system protection compared to other gasolines. Be sure the posted octane is at least 87. If the octane is less than 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 87 octane or higher and you still hear heavy knocking, your engine needs service. But don't worry if you hear a little pinging noise when you're accelerating or driving up a hill. That's normal, and you don't have to buy a higher octane fuel to get rid ofpinging. It's the heavy, constant knock that means you have a problem. You should keep a record with all parts receipts and list the mileage and the date of any service work you perform. See "MaintenanceRecord" in the Index. You can be injured and your vehicle could be damaged if you try to service work on a do vehicle without knowing enough about it. Be sure you have sufficient knowledge, experience, and the proper replacement parts and tools before you attempt any vehicle maintenance task. 0 Be sure to use the proper nuts, bolts and other fasteners. "English" and "metric" fasteners canbe easily confused.If you use the wrong fasteners, parts can later break or fall off. You could be hurt. 6-2