MMT

Some gasoline contains an octane-enhancing additive called MMT (Methylcyclopentadienyl Manganese Tricarbonyl). If you use such fuels, your emission control system performance may deteriorate and the CHECK ENGINE warning light/malfunction indicator lamp may turn on. If this happens, return to your authorized SUBARU Dealer for service. If it is determined that the condition is caused by the type of fuel used, repairs may not be covered by your warranty.

    See also:

    Unleaded gasoline
    The neck of the fuel filler pipe is designed to accept only an unleaded gasoline filler nozzle. Under no circumstances should leaded gasoline be used because it will damage the emission control sy ...

    System setup
    You can select the following menus only by operating the “TUNE/TRACK/CH” dial. ...

    Vehicle Dynamics Control system monitor
    Refer to “Vehicle Dynamics Control warning light/Vehicle Dynamics Control operation indicator light” and “Vehicle Dynamics Control OFF indicator light”. ...