Mercedes feared power unit issue would end Rosberg’s Russian GP

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Mercedes team boss Toto Wolff praised Nico Rosberg not only for his flawless display en route to winning Sunday’s Russian Grand Prix, but also for managing an issue on his power unit that could have ended his race.

Mercedes has struggled with the reliability of its power unit so far this season, with defending champion Lewis Hamilton suffering failures in qualifying for both of the last two races.

Rosberg suffered a dip in pace midway through the second stint of the race in Sochi that saw his lead over Hamilton dip from 12 seconds to just 7.5 seconds.

Hamilton ultimately had to back off due to a water pressure issue on his own power unit, but Wolff revealed after the race that Rosberg also had to manage a problem on his car.

“That race was anything but plain sailing today – it was a pretty stressful experience to get both cars home, and there was a point when we thought neither of them might make it to the flag,” Wolff said.

“First of all, congratulations to Nico, he did a perfect job all weekend and controlled the race from the front once again. He didn’t put a foot wrong.

“When we faced an issue on the MGU-K during the middle part of the race, he was able to do all the necessary steps to keep it under control and bring it home.

“As for Lewis, he drove brilliantly. Some really good, aggressive passing manoeuvres and clever racing brought him to P2 – and he was just getting his head down to charge when we saw a water leak and he was losing water pressure.

“The only thing to do was ask him to back off to bring the car home and fortunately that meant the situation stabilized but cost him the chance of racing Nico. No doubt he will be thinking about what could have been today – but it was a fantastic recovery after such a tough moment in qualifying yesterday.

“A one-two finish is always something special and to be savoured, especially with the performance advantage we enjoyed this weekend. We are pushing hard this year and finding the limits of our car – but we need to get on top of our issues so the drivers can battle it out on track themselves.

“That’s what we all want to see and what we will be working hard to achieve in the coming days before Barcelona.”