Aug.26 (GMM) Mercedes is resisting efforts to create parity in engine performance within formula one, according to Helmut Marko.

He is the motor sport consultant at Red Bull Racing, who are still pushing for clearance to have its Renault engines brought up to speed amid F1's current development freeze.

"It's frustrating," Dr Marko said in an interview with Austria's laola1.at.

"Renault is losing about three tenths of a second per lap, but so far there is no green light (for parity).

"First we would need an agreement within FOTA, but so far Mercedes is resisting," added Marko.

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