 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 Australia, and finished in first or second position in each Grand Prix until his home race at Germany, where he ended in fourth. He then resumed his podium run, with the exception of one retirement, until the end of the season, while Webber finished behind until the final two races. In 2012, the Red Bull team and Sebastian Vettel were able to achieve both championships for a third time, despite the fact the RB8 car did not enjoy the domice of the previous season and suffered some reliability problems related to the RS27s alternator. That year, Williams returned to its association with Renault, signing a deal to receive the RS27 engines until the end of 2013. Red Bull came back to a domit pace in the 2013 season and both the team and Sebastian Vettel secured their fourth consecutive title at the 