1995 Buick Roadmaster Owner's Manual - Page 219

Fuel Use regular unleaded gasoline rated at 87 octane or higher. It should meet specifications A-STM D4814,h the United States and CGSB3.5-92 in Canada. These fuels should havethe proper additives,so you should not have to add anything to fuel. the What about gasoline with blending materials that contain oxygen (oxygenates), such as MTBE or alcohol AfZBE is "methyl tertiary-butylether." Fuel that is no more than 15%W B E is fine for your vehicle. Ethanol is ethyl or grain alcohol. Properly-blendeg fuel that is no Tore than 10% ethanol is fine for yoqr vehicle. Methanol is methyl or wood alcohol. In the UnitedStates and Canada, it's easy to be sure you get the right kind gasoline (udeaded). You'll see of UNLEADED right on the pump. And only unleaded nozzles willfit into your vehicle's filler neck. Be sure the posted octaneis 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. I NOTICE: If you're usingfuel rated at 87 octane or higher and you still hear heavy knocking, your engine needs service. But don'tworry if you hear alittle pinging noise when you're acceleratingor driving up a hill. That's normal, and you don't haveto buy a higher octanefuel to getrid of pinging. It's the heavy, constant knock that means you have a problem. Fuel that is more than methanol is bad for 5% your vehicle. Don't use it. can corrode metql It parts in your fuel system and also damaiF plastic and'rubber parts. That damage woyldn'fpe covered under your warranty. And even 5% or at less, there must be "cosolvents'' and corrosion ireventers in this fuel to help avoid these problems.