Bellof had won the 1984 World Endurance Championship driving for the Rothmans-Porsche team, but decided against driving for the factory in 1985 to concentrate on Formula One.
Lancia was also involved in sportscar racing since 1979 with the Monte Carlo model, followed by the LC1 and LC2 prototypes; Lancia won the World Championship for Makes in 1981 and the program continued until 1985.
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The 1985 Budweiser GT was the sixth round of the 1985 World Endurance Championship.
It was also rising German star Stefan Bellof's last Grand Prix, as he was killed at the Spa-Francorchamps circuit in the 1000 km of Spa World Sportscar race a week later, driving a Porsche 956.