Helmut Marko
On 30 November 1979 Bürger had shared a BMW M1 entered by Dr. Helmut Marko, with Markus Höttinger in the 1000 km of Kyalami, retired. He and Höttinger were close friends, they both started racing the German Renault 5 Cup, then they were teammates in Team GS Sport and together graduated to the Procar series, becoming the most promising young German drivers, under the guidance of Jochen Neerpasch, general manager of Team BMW.