Mercedes-Benz had returned to the pinnacle of international racing. The 1934 season left no doubt about that. However, the new competitor Auto Union also proved a powerful force in the struggle for victory. The Stuttgart people answered the challenge with new generations of the W 25 in 1935. The most powerful version now developed 462 hp (334 kW) with a displacement of 4310 cubic centimetres.
This car gave Mercedes-Benz almost unlimited domination in the 1935 racing season: Rudolf Caracciola got back into top form and in his W 25 won the Grand Prix of Tripoli, the Eifel race, the French, Belgian, Swiss and Spanish Grand Prix races. He won the European champion's title in 1935.
Also in 1935, Luigi Fagioli won the Monaco Grand Prix, the Avus race and the Grand Prix of Barcelona - ahead of Caracciola. "1935 was a year of triumph for Mercedes-Benz," Alfred Neubauer recalls. "We captured first place in five of the seven classic Grand Prix races in Europe."