1993 Buick Park Avenue Owner's Manual - Page 246
1993 Buick Park Avenue Manual
Page 246 highlights
Gasolines for Cleaner Air Your use of gasoline with detergent additives will help prevent deposits from forming in your engine and fuel system. That helps keep your engine in tune and your emission control system working properly. It's good for your vehicle, andyou'll be doing your part for cleaner air. Many gasolines are now blended with materials called oxygenates. General Motors recommends that you use gasolines with these blending materials, such as MTBE and ethanol. By doing so, you can help clean the air, especially in those parts of the country that have high carbon monoxide levels. In addition, some gasoline suppliers are now producing reformulated gasolines. These gasolines are specially designed to reduce vehicle emissions. General Motors recommends that you use reformulated gasoline. By doing so, you can help clean the air, especially in those parts of the country that have high ozone levels. You should ask your service station operators if their gasolines contain detergents and oxygenates, and if they have been reformulated to reduce vehicle emissions. Fuel If you have the Supercharged 3800 V6 (L67) engine, use premium unleaded gasoline rated at 91 octaneor higher. It should meet specifications ASTM D4814 in the U.S. and CGSB 3.5-92 in Canada. These fuels should have the proper additives, so you should not have to add anything to the fuel. In the U.S. 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 will fit into your vehicle's filler neck. Be sure the posted octane is at least 9 1. If the octane is less than 9 1, you may get a heavy knocking noise when you drive. (In an emergency, you may be able to use lower octane - as low as 87 -- if heavy knocking does not occur.) If you're using 91 or higher octane unleaded gas and you still get heavy knocking, your engine needs service. What about gasoline with blending materials that contain oxygen, such as MTBE or alcohol? MTBE is "methyl tertiary-butyl ether.'' Fuel that is no more than 15% MTBE is fine for your car.