Although they failed to win the title in 1967, by the end of the season, the Lotus 49 and the DFV engine were mature enough to make the Lotus team dominant again. However, for 1968 Lotus had lost its exclusive right to use the DFV. The season-opening 1968 South African Grand Prix confirmed Lotus's superiority, with Jim Clark and Graham Hill finishing 1–2. It would be Clark's last win. On 7 April 1968, Clark, one of the most successful and popular drivers of all time, was killed driving a Lotus 48 at Hockenheimring in a non-championship Formula Two event. The season saw the introduction of wings as seen previously on various cars, including the Chaparral sports car. Colin Chapman introduced modest front wings and a spoiler on Hill's Lotus 49B at the 1968 Monaco Grand Prix. Graham Hill won the F1 World Championship in 1968 driving the Lotus 49.