1995 Buick Park Avenue Owner's Manual - Page 223

Fuel 3800 L36 Engine (Code K) The 8th digit of your vehicle identification number (VIN) showsthe code letter foryour engine. You will find the VIN at the top left of your instrument panel. (See "Vehicle Identification Number" in the Index.) Use regular unleaded gasoline rated at 87 octane or higher. It should meet specifications ASTM D48 14 in the United States and CGSB 3.5-92 in Canada. These fuels should have the proper additives, so you should not have to add anything tothe fuel. of pinging. It's the heavy, constant knock that means you have a problem. What about gasoline with blending materials that contain oxygen (oxygenates), such as MTBE or alcohol? MTBE is "methyl tertiary-butyl ether." Fuel that is no more than 15% MTBE is fine for your vehicle. Ethanol is ethyl or grain alcohol. Properly-blended fuel that is no more than 10% ethanol is fine for your vehicle. Methanol is methyl or wood alcohol. - In the United States and Canada, it's easy to be sure you get the right kind of gasoline (unleaded).You'll see UNLEADED righton the pump. And only unleaded nozzles will fit intoyour vehicle's filler neck. Be sure theposted 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 a hill. That's normal, up and you don't have to buy a higher octane fuel to get rid NOTICE: Fuel that is more than5% methanol is bad for it. your vehicle. Don't use It can corrode metal parts in your fuel system and also damage plastic and rubber parts. That damage wouldn't be covered under your warranty. And even 5% or at less, there must be "cosolvents" and corrosion preventers in this fuel to help avoid these problems. 6-3