Red Bull team boss Christian Horner says reliability will be the 'number one challenge' when the new F1 season gets underway.Drastic changes to F1's engine regulations are set to have a major impact on the year ahead, with Red Bull's rivals hoping that the move to 1.6 litre turbo-charged units will allow them to take the fight to the defending champions.The new regulations will make pre-season testing, which kicks off later this month in Spain, more important than ever and Horner insisted that the first challenge would be get on top of any reliability problems with the new cars."As you know, Adrian Newey does not have a reputation for having a car ready ahead of time, so I am sure...
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