Daniel Ricciardo is losing faith in Renault's reliability after the Australian nearly missed out on Saturday's Chinese Grand Prix qualifying due to an engine failure in final practice. "I’ll never give up hope but for sure the window of optimism reduces over time," said the 28-year-old, who retired from the previous race in Bahrain with an energy store problem in the power unit. Red Bull use Renault engines that the team has badged Tag Heuer after their sponsor. The French manufacturer has had a hard time coming to terms with the 1.6 litre V6 turbo-hybrid power units introduced at the start of 2014 and, five years in, still lags Mercedes and Ferrari. Either Ricciardo or...
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