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1979 French Grand Prix, the glory years of Alain Prost and René Arnoux<unk>when the French squad was fought for the World Championships in and<unk>and its withdrawal at the end of the 1985 season. Sage stayed with Renault until the end of 1987, when it stopped supplying its turbo engines to other teams. Sage stayed with Renault until the end of 1987, when it stopped supplying its turbo engines to other teams.