Subaru WRX & WRX STI Manuals 2015 WRX & WRX STI Owner's Manual | Page 331

7-4

Starting and operating/Fuel

having lower sulfur to determine if the
problem is fuel related before returning
your vehicle to an authorized dealer for
service.
! 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 condition is caused
by the type of fuel used, repairs may not
be covered by your warranty.
! Gasoline for cleaner air
You