Sebastian Vettel has blamed excessive oversteer for his early season struggles with the Red Bull RB10 with the German reverting to an old chassis for this weekend's Spanish GP in a bid to cure his 2014 woes. The reigning World Champion has been out-qualified at three of the opening four races by new team-mate Daniel Ricciardo and, to rub further salt into the wounds, the German was ordered to let the Australian past at both the Bahrain and Chinese GPs. Whilst the RB10 is not as dominant as its RB9 predecessor, it is clear that Vettel has been extracting less from the car than Ricciardo as he struggles with stability at the rear - suggesting the ban on exhaust blown diffusers could be a key...
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