Renault have told Red Bull they want to stop supplying them with engines after the 2018 season, Sky F1 understands. The move comes as Renault prepare to add McLaren to their customer roster from next year. If a Red Bull-Renault split materialises, Red Bull would most likely have to turn to Honda for their 2019 engine supply. As part of a series of interlinked moves, Honda is set to be announced as the new engine supplier for Toro Rosso, Red Bull's junior team, at this weekend's Singapore GP. However, as it stands, the Renault engine is more competitive than Honda's and Red Bull are already a distant third in the Constructors'' Championship behind Mercedes and Ferrari. In recent weeks Red...
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