Team boss Christian Horner stepped up his attack on Red Bull's engine supplier Renault after the Austrian grand prix.
At the debut of the energy drink company's very own grand prix at the Red Bull Ring, the premier Renault-powered team was not only uncompetitive, but world champion Sebastian Vettel was struck yet again by technical trouble.
The home soil failure, with German Vettel retiring voluntarily to save engine mileage, came among swirling paddock rumours Red Bull is on the cusp of approving a project to build its very own F1 engine.
Vettel, meanwhile, effectively wrote off his chances of winning a fifth consecutive title in Austria.
"You don't have to be a genius," the...
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