Renault F1 power unit Renault's problematic V6 power units are set to be a factor in the final Formula 1 races of the season, as Red Bull, Toro Rosso, Caterham and Lotus teams may be forced to go easy on mileage with as the limit of engines they can use in the season is fast being reached. Speaking ahead of the Japanese Grand Prix weekend, Renault Sport F1 head of track operations Remi Taffin predicted, 'Reliability will start to play a major role in results at this point in the season since every team and driver has had to mix and match as we have learnt more on the operation of the power unit.' 'To keep aces in hand, we may even see teams run fewer miles in practice to save the engines...
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