 Complete the following phrase:  Gerd Kremer, head of product placement in motorsport at Mercedes-Benz, was tasked with inviting former F1 world champions and Nürburgring race winners. Helping his cause was Mercedes long tradition offering heavily discounted road cars to F1 drivers: many saw participation as a way of repaying the brand for their support. Only five of the living world champions did not compete. Juan Manuel Fangio, then aged 72, did not race but was present in his capacities as a Mercedes-Benz ambassador. Emerson Fittipaldi and Mario Andretti were taking part in Pole Day for the 