In 1934, the W25 won four major races (Eifelrennen, Coppa Acerbo, Spanish and Italian GP) compared to three for Auto Union (German, Swiss and Czechoslovakian GP), plus the Klausenpass hillclimbing event. These popular uphill races were usually dominated by the superior traction of the mid engine Auto Union of Hans Stuck, who won at Felsberg, Kesselberg, Freiburg Schauinsland and Mont Ventoux. The German cars also took two wins in Italy, where the major competitors came from. On the other hand, two events on the soil of World War I adversaries ended rather embarrassingly. The 1934 French Grand Prix held near Paris had been a disaster for both German teams, as none of their cars finished. The 1934 Belgian Grand Prix was held on the Circuit de Spa-Francorchamps which then had a tight corner named after the nearby Ancienne Douane, the old customs station at the former border with Germany. The border had been moved after the war, but the Belgians set up an even tighter chicane for the Germans: Custom officials demanded a hefty sum of duty for the special race fuel containing alcohol which was consumed by the supercharged German engines. Both teams withdrew with short notice.