It is no secret that this week's F1 pre-season test at Bahrain International Circuit could be key to Red Bull Racing's chances of retaining its world titles, but could also have significance for its long-term relationship with engine partner Renault.That is the claim of former F1 team owner Giancarlo Minardi, who suggests that ongoing reliability problems for the French engine supplier could prompt the four-time reigning champions to explore alternatives for 2015.While it is locked in with Renault for the coming year, Red Bull completed only 21 laps in the four days of running at Jerez last month and, along with the regie's other customers – Toro Rosso and Caterham – lags behind the...
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