Jewel in the history of Delage D6 made ​​his first appearance at the 24 Hours of Le Mans in 1937, with  a fourth place finish for Jacques Valence and Louis Gérard. In the resumption of motorsport after World War II, the D6 was the focus of the French manufacturer, both for road and competition. The only model shown by Delage at the Paris Motor Show in 1947, two years later would be at the start of the 17th edition of the 24 Hours of Le Mans, the first since 1939. While a young brand named Ferrari won in its first participation with the 166 MM of Luigi Chinetti and Lord Selsdon, Delage was the highest placed French manufacturer, with the second place of Juan Jover and Henry Louveau. The latter would race again in 1950 in the final appearance of the D6 at Le Mans, finishing seventh with Jean Estager.

Year : 17th edition of the 24 Hours of Le Mans (25th & 26th June 1949)
Number of cars entered : Four
Technical Information :
3 litre straight 6.
Drivers :
Francesco Godia Fales-Louis Gérard (n°14)
Juan Jover-Henri Louveau (n°15)
Gaston Serraud-Marc Versini (n°16)
Auguste Veuillet-Edmond Mouche (n°18)
Results :
2nd (Juan Jover-Henri Louveau)
4th (Francesco Godia Fales-Louis Gérard)
Retired (Gaston Serraud-Marc Versini, Auguste Veuillet-Edmond Mouche)