Subaru WRX & WRX STI Manuals 2016 WRX & WRX STI Owner’s Manual | Page 393

7-4

Starting and operating/Fuel

! 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 light may turn on. If this
happens, return to your authorized
SUBARU Dealer for service. If it is
determined that the con F