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Red Bull team principal Christian Horner has urged engine supplier Renault to improve their performance after a disappointing result at the Austrian Grand Prix.
Daniel Ricciardo came home in eighth place while Sebastian Vettel's RB10 suffered a power unit problem on the second lap of the race.
Vettel was able to get going after his issue but he lost a full lap, eventually retiring from the race mid-distance.
His third retirement leaves him over 100 points behind championship leader Nico Rosberg.
"We’ve had another issue today but at the end of the day we’ve won all four world championships and all our races with Renault and we have to trust them to get over these issues," Horner told Sky Sports.
"We have to understand the issues, there’s some things we can fix despite the engine freeze. [But] there’s some things that at this stage of the year we should really be on top of."
Horner was asked about comments made by Red Bull consultant Helmut Marko earlier this weekend, who hinted that Red Bull could search for a different engine supplier - or even produce their own engines - if Renault's situation does not improve.
"That’s not something we want to do, we’re chassis designers," said Horner. "But we want to be competitive and Renault need to sort their issues out and change something going forward.
"We’re going to have Renault engines next year and maybe even beyond that but we need them to get out of the issues we’re in. We’ve had eight Mercedes in the top 10 here and that’s no coincidence."
