 Complete the following phrase:  At the end of 2010, when Renault sold their remaining stake in the Enstone-based Formula One team, the engine operations at Viry-Châtillon were formed into a subsidiary known as Renault Sport F1. Renault Sport F1 continued to supply engines to their former works team and Red Bull, and expanded their customers to Lotus Racing at the end of 2010. Red Bull again won both titles in , the Red Bull RB7 being unmatched by their opponents, and gained 18 pole positions throughout the season. Vettel held the championship lead from the first race in 