1993 Oldsmobile Achieva Owner's Manual - Page 213

6 Fuel If you try to do your own service work without knowing enough about it, your vehicle couldbe damaged. 2.3L Quad OHC and Quad 4 Engines (Codes 3 and D) and 3300 V6 Engine (Code N) : The 8th digit of your Vehicle Identification Number (VIN) shows the code letter for your engine.You will find the VIN at the top left your of instrument panel. ( S e e the Index under Ehicle Identijkation Number.) Use regular unleaded gasoline rated at 87 octane or higher. It should meet specifications ASTM D4814 in the U.S. and CGSB 3.5-92 in Canada. These fuels should have the proper additives, so you should not have to add anything to the fuel. In the U.S. and Canada, it's easy to be sure you get the right kindof gasoline (unleaded). You'll see "UNLEADED" right on the pump. And only unleaded nozzles will fit into your vehicle'sfiller neck. Be sure the posted octane is at least 87. If the octane is less than you may get 87, a heavy knocking noise when you drive. If it's bad enough, it can damage your engine. If you're using fuel rated at87 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 pinging. It's the heavy, of constant knock that means you have a problem. 211