1995 Oldsmobile 88 Owner's Manual - Page 228

Gasolines for Cleaner Air Your use of gasoline with deposit control additives will help prevent deposits from forming in yourengine and fuel system. That helps keep your engine in tune and your emission control system working properly. It's good for your vehicle, and you'll doing your part be for cleaner air. Fuel 3800 Supercharged Engine (Code 1) The 8th digitof your vehicle identification number (VIN) shows the code letter your engine.You will for find theVIN at the top left your instrument panel. of (See "Vehicle Identification Number" in the Index.) Use premium unleaded gasoline rated 91 octane or at Many gasolines are now blended with oxygenates. General Motors recommends that you use gasolines withhigher. You may use middlegrade or regular unleaded these blending materials,such as MTBE and ethanol. By gasolines, but your vehicle may not accelerate as well. The gasoline you use should meet specifications ASTM doing so, you can help clean air, especially in those the D4814 in the United States and CGSB 3.5-92 in parts of the country thathave h g h carbon monoxide Canada. These fuels should have the proper additives, so levels. you should not have to add anything to the fuel. In addition,some gasoline suppliers are .now producing In the United States and Canada, it's easy to be sure you reformulated gasolines. These gasolines are specially get the right kind gasoline (unleaded). You'll see of designed to reduce vehicle emissions. General Motors UNLEADED right on the pump. And only unleaded recommends that you use reformulated gasoline. By nozzles willfit into your vehicle's filler neck. doing so, you can help clean air, especiallyin those the parts of the country that have high ozone levels. Be sure the posted octane for premium is at least 91 (at least 89 for middle grade and 87 for regular). octane If the You should ask your service station operators if their m is less than 87, you y get a heavy knocking noise when gasolines contain deposit control additives and you drive. If it's bad enough,it can damage your engine. oxygenates, andif they havebeen reformulated to reduce vehicle emissions. 91 If you're using fuel rated at octane or higher and you still hear heavy knocking, your engine needs service. But don't worry if hear a little pinging noise when you 6-4