Red Bull has had numerous problems with Renault power this year PA Images Enlarge Red Bull insists it has not issued an ultimatum to engine supplier Renault and has denied speculation it is considering ditching the French manufacturer next year. Red Bull has put pressure on Renault this year after the V6 turbo power unit has not met expectations and has proved to be the weak point in the RB10 package. A series of stories in the German press suggested Red Bull was running out of patience with Renault, but team principal Christian Horner says that is not the case. "Renault fully understand the predicament they are in," he said. "[Renault CEO] Carlos Ghosn was in Monte Carlo...
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