Red Bull raised concerns with Renault about the direction of their engine programme as far back as 2012, team principal Christian Horner has revealed.
The French engine maker, who supply the Formula 1 champions, had a problem-plagued start to the new V6 turbo hybrid era while Mercedes have been dominant since the opener in Australia in March.
Horner was heavily critical of Renault after last month's Austrian Grand Prix, where four times world championSebastian Vettel retired and Daniel Ricciardo finished eighth, when he called their engine performance unacceptable.
'We raised our concerns as far back as the end of 2012 with the direction the project was going,' Horner told...
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