See also:

Fuel octane rating
This octane rating is the average of the Research Octane and Motor Octane numbers and is commonly referred to as the Anti Knock Index (AKI). Using a gasoline with a lower octane rating can ca ...

Precautions against vehicle modification
Always consult your SUBARU dealer if you want to install any accessory parts to your vehicle. CAUTION Do not perform any of the following modifications. Such modifications can interfere with pro ...

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 t ...