1994 Cadillac Fleetwood Owner's Manual - Page 259

NOTICE: I If you try to do your service work without knowing enough own about it, your vehicle could be damaged. FUEL '1 I i ' Use regular unleaded gasoline rated at 87 octane or 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 thefuel. In the U.S. .and Canada, it's easyto be sure get the right kindof you gasoline.(unleaded). You'll see "UNLEADED" right.on the pump. And only unleaded nozzles will fit into your vehicle's filler neck. Be sure theposted octane is at least 87. If the octane is lessthan 87, you may get a heavy knockingnoise when you drive. it's bad.enough, it can If damage your engine. If you're usingfuel rated at87 octane or higher and you stillhear heavy knocking, yourengine needs service. But don't worry you hear a little if pinging noise when you're accelerating or driving up a. hill. That's normal, 246