1995 Chevrolet Blazer Owner's Manual - Page 243

The gasoline you use 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 add anythingto the fuel. In theUnited 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 91 for premium, 89 for middle grade and 87-forregular. If the octane is less than 87, you may geta heavy knocking noise when you drive. If it's badenough, it can damage your engine. If you're using fuel rated at91 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 upa hill. That's normal, and you don't have to buy a higher octane fuel to get ridof it. It's the heavy, constant knock that means you have problem. a 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 that is no more than fuel 10%ethanol is fine for your vehicle. Methanol is methyl or wood alcohol. ~ NOTICE: 1 Fuel that is more than 5%methanol is bad for your vehicle. I Don't use it. It can corrode metalparts'inyour fuel system and 1 also damage plastic and rubber parts. That damage wouldn't be 1 covered under your warranty. even at 5% or less, there And must be "cosolvents" and corrosion preventers in this fuel to help avoid these problems. ~ ~ 6-3