Mercedes chief Toto Wolff believes that Red Bull compromise themselves by opting to use a different fuel and oil supplier to Renault their engine supplier, but his colleague Christian Horner has rubbished the notion and claims it is actually an advantage for the energy drinks outfit Red Bull use ExxonMobil while Renault use BP and the company's Castrol lubricants and Mercedes, on the other hand, are supplied by Petronas. During the final week of testing in Barcelona,  Wolff said in an interview, “The strategic mistake is to opt for the commercial deal rather than making sure you are on the same specification of fuel and oil as the works team.” “You’re running different...
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