Christian Horner admits Sebastian Vettel is "frustrated" at poor reliability this year but is certain he will respond positively.

Vettel retired from the Austrian Grand Prix on Sunday having already gone a lap down when he lost drive in the opening laps of the race. Following the season-opening Australian Grand Prix and the race in Monaco it marked the third time that Vettel has had to retire with reliability issues but Horner said the reigning champion has enough experience to deal with his frustrations.

"Like any driver, he's going to be frustrated," Horner said. "But he's a four-time world champion. He's won all those grands prix with Renault power. He's got the same engineers and mechanics working on his car that he had all the success with.

"He's mature enough to know that these situations aren't designed and it's not due to anyone not trying hard. It will switch and he's not letting his chin drop."

And Horner admitted Vettel could have finished the race on Sunday but with prospects of scoring a point very limited Red Bull had opted to protect the engine.

"We did it to conserve engine mileage. Obviously engines are fairly limited this year and it gives us the opportunity to run a bit more on Fridays. So it was a tactical retirement, which is within the regulations. Being a lap and a half down, it didn't make sense to just put unnecessary mileage on the engine."


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