Carlos Sainz Jr says it is “crucial” that Toro Rosso and Red Bull work closely together to improve the reliability of the Renault power unit.

While Toro Rosso was able to complete 136 laps on day three of testing at Jerez, power unit issues for Daniel Ricciardo limited him to less than 50. With Renault only supplying the two teams this season, Sainz Jr said it is important Toro Rosso works closely with the senior team to ensure both can learn from each other during testing.

“I think it is crucial,” Sainz Jr said. “We are working more together than ever with Red Bull, so they will look at our mileage positively and we will learn from their reliability issues. It shows the good job STR at doing at this stage.”

And Sainz Jr explained his final day of running in the car at the first test was not without its own problems despite the high mileage.

“Small niggles but the good thing is that though we had a couple of reliability issues, they were small and we managed to solve them and kept going. We are starting to know a new car and we are very happy with this.”

Click here for live coverage of day four at Jerez

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Andrew Lewin

Andrew first became a fan of Formula 1 during the time when Michael Schumacher and Damon Hill were stepping into the limelight after the era of Alain Prost, Nigel Mansell and Aryton Senna. He's been addicted ever since, and has been writing about the sport now for nearly a quarter of a century for a number of online news sites. He's also written professionally about GP2 (now Formula 2), GP3, IndyCar, World Rally Championship, MotoGP and NASCAR. In his other professional life, Andrew is a freelance writer, social media consultant, web developer/programmer, and digital specialist in the fields of accessibility, usability, IA, online communities and public sector procurement. He worked for many years in magazine production at Bauer Media, and for over a decade he was part of the digital media team at the UK government's communications department. Born and raised in Essex, Andrew currently lives and works in south-west London.

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