Ferrari's initial fortunes ran dry after 1964, and its began to receive its titles in isolated sprees.[36] Ferrari first started to slip in the late 1960s, when it was outclassed by British teams using the inexpensive, well-engineered Cosworth DFV engine.[38][39] The team's performance improved markedly in the mid-1970s thanks to Niki Lauda, whose skill behind the wheel granted Ferrari a drivers' title in 1975 and 1977; similar success was accomplished in following years by the likes of Jody Scheckter and Gilles Villeneuve.[36][40] The team also won the Constructors' Championship in 1982 and 1983.[17][41]