They choose the Circuito de la Costanera Norte, which used the wide service roads of the Aeroparque Jorge Newbery.
in front of an estimated crowd of 100,000, it was the winner of the 1956 race, Stirling Moss, Fangio’s team-mate, who took an early lead from the entire fleet of Ferraris, piloted by Eugenio Castellotti, Peter Collins, Alfonso de Portago and Masten Gregory in the Temple Buell Ferrari.
At the end of lap one, Castellotti pits with differential problems and loses more than seven minutes, and hands the car over to Luigi Musso.
During the second lap, the Maserati 300S of Oscar Cabalén skidded off the track and into the crowd, causing numerous injuries.
[5][6][7] At the end of the third lap, Collins retired his Ferrari 290 S with dangerously low oil pressure, meanwhile, Moss was marching way at the head of field, now being followed by Gregory, de Portago and Behra.
At every turn, Moss reduces the lead, but the partnership of Gregory/Castellotti/Musso hold to take the spoils, winning in a time of 6hrs 10:29.9 mins., averaging a speed of 100.775 mph.
[9][10] As a result of Fangio’s retirement, Moss and Menditéguy in car number 31, took an impressive victory,[11][12][13] Class Winners are in Bold text.