1995 Oldsmobile 88 Owner's Manual - Page 227

Fuel 3800 Series I Engine (CodeK) I The 8th digit of your vehicle identification number (VIN) shows the code letter for your engine. You will find the VIN at the top of your instrument panel. left (See "Vehicle Identification Number" in the Index .) Use regular unleaded gasoline rated at octane or 87 higher. It should meet specifications ASTMD4814 in the United States and CGSB 3.5-92 in Canada. These fuels should have the proper additives, so you should not have to addanything to the fuel. of pinging. It's the heavy, constant knock that means you have aproblem. What about gasoline with blending materials that contain oxygen (oxygenates),such as MTBE or alcohol? WTBE 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 chat is no more than 10% ethanol is fine for your vehicle. 'Methanolis 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 right on the pump. And only unleaded nozzles willfit into your vehicle'sfiller neck. 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.I it's bad enough, it can damage your engine. f NOTICE: Fuel that is more than methanol is bad for 5% your vehicle. Don't use it. 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 %osolvents" and corrosion preventers in this fuel to help avoid these problems. 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 a little pinging noise when hear you're accelerating or driving up a hill. That's normal, and you don't have to buy ahigher octane fuel to getrid 6-3