Red Bull might be forced to quit Formula 1 if Renault follow through with their own threats to exit the sport, according to Christian Horner. The French manufacturer is weighing up various options which could include buying Toro Rosso to expand its marketing potential, or it could leave F1 according to boss Cyril Abiteboul. That latter scenario could see Red Bull exit too, according to Horner, who said it was unlikely Mercedes or Ferrari would supply it with engines. "I think you have to – like with all these things – look at the context that comment was made in," he said of Helmut Marko's recent threat to pull Red Bull out of F1. "I didn’t make that...
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