A Ferrari 158 car officially entered by the American privateer team NART sealed the win of the 1964 F1 World championship with John Surtees, as the works team competed the last two races (the United States Grand Prix and Mexican Grand Prix) in cars painted white and blue - the national colours of the teams from the United States. This was done as a protest concerning arguments between Ferrari and the Italian motorsport body ACI regarding the homologation of a new mid-engined Ferrari race car. The 1964 Mexican Grand Prix was the last time Ferrari cars wore other than the traditional red colour in Formula One.