Mario Andretti drove in place of Miles in the next race at the Nürburgring, but crashed heavily on the first lap, badly damaging the chassis. At the International Gold Cup Jochen Rindt was forced to drive the 63, despite protesting furiously to Chapman, and in an under-strength field of F1 and F5000 cars came second, some way behind Jacky Ickx's Brabham. In the remaining races of the season Miles drove the car in the Italian, Canadian and Mexican races, retiring from all three with engine, gearbox and fuel pump failures, with Andretti retiring at Watkins Glen with broken suspension. After losing both championships to Jackie Stewart's Matra, Chapman finally decided that it was time to abandon the 4WD car and concentrate on the designs for the Lotus 72.