2008 Jeep Wrangler Owner's Manual - Page 339

338 STARTING AND OPERATING It is even more important to look for gasoline without MMT in Canada, because MMT can be used at levels higher than those allowed in the United States. MMT is prohibited reformulated gasoline. in Federal and California- Fuel System Cautions CAUTION! Follow these guidelines to maintain your vehicle's performance: • The use of leaded gasoline is prohibited by Federal law. Using leaded gasoline can impair engine performance, and damage the emission control system. • An out-of-tune engine, or certain fuel or ignition malfunctions, can cause the catalytic converter to overheat. If you notice a pungent burning odor or some light smoke, your engine may be out of tune or malfunctioning and may require immediate service. Contact your authorized dealer for service assistance. Materials Added To Fuel All gasoline sold in the United States is required to contain effective detergent additives. Use of additional detergents or other additives are not needed under normal conditions and would result in additional cost. Therefore you should not have to add anything to the fuel.