Oscar Larrauri contested his first car races in the Argentine Formula 3 Championship in 1979. In the early 1980s, he came to Europe and drove again to Formula 3 races. With seven individual victories in the European Formula 3 championship , he secured the title in 1982 with the Italian team Euroracing . An unsuccessful year followed in the Formula 2 European Championship, where he competed for Minardi . His career stalled and was only given new impetus by the Swiss Walter Brun , who accepted the Argentine into his sports car team. Until the early 1990s, he drove the Porsche 962 in many sports car races. The highlight was the victory in the Group C race in Jerez in 1986 and second place overall in the 24 Hours of Le Mans in the same year.
When Brun expanded his activities to Formula 1 , Larrauri came to this racing series with EuroBrun Racing . The company turned into a fiasco, Larrauri could only qualify for seven world championship races in two years and, like the team, remained without points.
In 1996, after a year in the Italian touring car championship, he returned to Argentina, where he secured the title in the national production car championship in 1997 and 1998 in a BMW 320i .