Renault Sport’s Managing Director Cyril Abiteboul is “frustrated” by Max Verstappen’s continued criticism of Renault’s “competitive” power unit.

The Red Bull driver struggled to keep his temper under control during last fortnight’s Singapore Grand Prix FP3 session, where Verstappen said the unit was making “weird noises” and “doing its own thing.”

Speaking to Sky Sports F1 in Sochi, Abiteboul said that he was “frustrated” only one driver was talking about the quality of Renault’s power unit when it’s run by six cars.

Abiteboul said in Friday’s Team Bosses Press Conference that Verstappen was a “demanding user.”

He agreed the unit’s drivability was “not perfect” at the start of the weekend, but affirmed Renault’s power unit was “competitive”.

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