1996 GMC Savana Van Owner's Manual - Page 226

1 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. You should keep a record with all parts receipts and list the mileage and the dateof any service work you perform. See "Maintenance Record" in the Index. 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. L I You can be injured and your vehicle could be damaged if you to do service work on a try vehicle without knowing enough about it. Be sure you have suffkient 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 can be easily confused. If you use the wrong fasteners, parts can later break or fall off. You could be hurt. Use regular unleaded gasoline rated at 87 octane,or higher. At a minimum, it 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 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 youhear a little pinging noise when you're accelerating or drivingup a hill. ,That's normal, and you don't have to buy a higher octane fuel to get rid of pinging. It's the heavy, constant knock that means you have a problem. 6-2