An engineer working for Red Bull’s engine supplier Renault has dismissed reports claiming that the world champions may be cheating their way to a fourth F1 world championship title.

Recent reports have cast doubt on the superior traction and odd tones of Sebastian Vettel’s RB9 as the German cruises to yet another championship victory.

But Ricardo Penteado, a Brazilian engineer for Renault, said claims of illegal traction control are clearly wide of the mark.

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