Renault chief Cyril Abiteboul says the French manufacturer doesn't take any notice of what Red Bull team chief Christian Horner says about its engine anymore, and hasn't done so since 2015 when the two companies relationship first became strained.
Red Bull has used Renault engines since 2007 and won the championship with them in 2010, 2011, 2013 and 2014. However the switch to V6-Hybrid engines hasn't been as successful and caused the two parties to fall out in 2015 which almost led to them splitting.
The issue was resolved and Red Bull continued to use Renault engines, but renamed them under sponsor Tag Heuer. But the strained relationship has continued to go downhill and earlier this year Red Bull confirmed it would switch to Honda power for 2019.
But that hasn't stopped the criticism and at last weekend's Hungarian Grand Prix Horner hit out at Renault again following Max Verstappen's retirement – the team's third engine related retirement in four races.
"We pay multi millions of pounds for these engines, for a first-class product, a state-of-the-art product, and you can see it is quite clearly some way below that," he said whilst speaking to Sky Sports F1.
Adding: "So it is frustrating. That is what it is. We still have Daniel in the race and I will let Cyril [Abiteboul] come up with his excuses afterwards."
Abiteboul has hit back and says Renault are "done" with Red Bull and wished them luck with their Honda switch, which he suggested is driven by money as Honda are expected to pay Red Bull tens of millions each season, as they did with McLaren.
"Our bosses have stopped reading what Christian Horner is saying about us since 2015," Abiteboul is quoted as saying by Autosport on Sunday after the race.
"It's very clear that we don't want to have any dealings with them any more. It's very clear it's done.
"They will have their engine partner that will be paying a helluva money to get their product on board, and I wish them good luck. I have nothing else to say."
