2011 Lexus IS 350 Owners Manual - Page 515

6-1. Specifications n Lexus does not recommend gasoline containing MMT Some gasoline contains octane enhancing additive called MMT (Methylcyclopentadienyl Manganese Tricarbonyl). Lexus DOES NOT recommend the use of gasoline that contains MMT. If fuel containing MMT is used, your emission control system may be adversely affected. The malfunction indicator lamp on the instrument cluster may come on. If this happens, contact your Lexus dealer for service. NOTICE n Notice on fuel quality l Do not use improper fuels. If improper fuels are used the engine will be damaged. l Do not use leaded gasoline. Leaded gasoline can cause damage to your vehicle's three-way catalytic converters causing the emission control system to malfunction. l Do not use gasohol other than that stated here. Other gasohol may cause fuel system damage or vehicle performance problems. l IS250: Use of unleaded gasoline with an octane rating lower than 91 may result in engine knocking. Persistent knocking can lead to engine damage and should be corrected by refueling with higher octane unleaded gasoline. l IS350: Use of unleaded gasoline with an octane rating lower than 91 may result in engine knocking and significantly reduced performance. Persistent knocking can lead to engine damage and should be corrected by refueling with higher octane unleaded gasoline. n Fuel-related poor driveability 6 If after using a different type of fuel, poor driveability is encountered (poor hot starting, vaporization, engine knocking, etc.), discontinue the use of that type of fuel. n When refueling with gasohol Vehicle specifications Take care not to spill gasohol. It can damage your vehicle's paint. 527