Following the 1955 Le Mans disaster, Mercedes-Benz had withdrawn its factory-backed race team from all motorsport activities. It was not until 1985 that Mercedes reintroduced itself to motorsport, entering the 1985 World Sportscar Championship. Starting off as an engine supplier to Sauber, this partnership bloomed into a full-time factory-backed effort. Despite Mercedes winning the World Sportscar Championship twice in 1989 and 1990, they eventually withdrew at the end of 1991 following disappointing results.