Methylcyclopentadienyl manganese tricarbonyl (MMT) is an octane enhancer that forms manganese particles when burned as a gasoline additive. These particles can be emitted to the atmosphere or deposited on engine and vehicle components, causing concern in either case.
URL: http://www.theicct.org/documents/MMT_ICCT_2004.pdf
fuel additives, octane, anti-knock properties, clean fuel, lead alternatives | 
