GM Cadillac Deville_Fleetwood_ELD_Seville 1990-1998

Fuel Recommendations


The engine is designed to operate on unleaded gasoline ONLY and is essential for the proper operation of the emission control system. The use of unleaded fuel will reduce spark plug fouling, exhaust system corrosion and engine oil deterioration.

In most parts of the United States, fuel with an octane rating of 91 should be used unless otherwise specified by the vehicle manufacturer for performance reasons. Using fuels with a lower octane may decrease engine performance, increase emissions and engine wear.

In some areas, fuel consisting of a blend of alcohol may be used; this blend of gasoline and alcohol is known as gasohol. When using gasohol, never use blends exceeding 10% ethanol or 5% methanol.

The use of fuel with excessive amounts of alcohol may jeopardize the new car warranties.