Shell V-Power is the brand name given to Shell's enhanced high specification fuels for road motor vehicles including Shell V-Power Nitro+ and Shell V-Power Diesel. Introduced in Italy in 2001, Shell relaunched the fuel in March 2008, under the name Nitrogen-Enriched Shell V-Power, with nitrogen-containing detergents. Initially used for higher octane Super Unleaded petrol/gasoline (formerly known as Optimax in some regions), it is now additionally used for high specification diesel fuel.