2009 Lexus GS 450h Owners Manual - Page 633

6-1. Specifications n Lexus does not recommend gasoline containing MMT Some gasoline contains octane enhancing additive called MMT (Methylcy clopentadienyl 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 Using unleaded gasoline with an octane number or rating lower than that stated here will cause persistent heavy knocking. At worst, this will lead to engine damage. n Fuel-related poor driveability 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 Take care not to spill gasohol. It can damage your vehicle's paint. 576 GS_HV_U (OM30B44U) March 8, 2010 10:03 am