However, following regulation changes in the 2014 Formula 1 season, Red Bull faced a challenging period after previously securing four consecutive constructors' championships from 2010 to 2013.
Horner has disclosed that Newey was 'half an hour' from leaving Red Bull during this challenging period, tempted by offers from Ferrari.
“Our engine supplier completely missed the target,” said Horner on the Eff Won with DRS podcast. “At that point, Sebastian Vettel leaves because of the engine.
“Adrian came very close to leaving. He was about half an hour. Ferrari came hard for him and they promised him the world - ‘you can have a Hollywood lifestyle, fly into the factory from Monaco every day, not pay any tax, you can design a road car'.
“I managed to persuade him to stay by saying: ‘We will do a road car, if you want to do a road car then we will do a road car!”
“I think when I was in my early 50s, I thought that by 60 I would go lie on a beach," Newey told the Telegraph. "But the reality is I’d get bored. I know I would. I remember Mario Andretti, for whom I race-engineered when he was 47 and still so competitive.
"Later on he started having some accidents and it was clear his competitiveness was decreasing. I bumped into him a few years later and he said ‘Look I know I’m not as sharp as I used to be. But as long as people are silly enough to give me a drive, I’ll keep driving until I stop enjoying it.’ I think that’s a good way of looking at things.
“If I feel in myself and or if other people say to me ‘Look, your contribution isn’t useful anymore’ then I’ve got to take that on board because the last thing I want to do is to let the team down. But as long as I feel I’m able to contribute… hopefully I’m still contributing now.”
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