Mercedes' improved straight-line speed has raised some eyebrows at Red Bull, however Helmut Marko says the team have accepted the FIA's ruling that there is nothing illegal about their engine.
While Mercedes and Honda-powered Red Bull were evenly matched in terms of engine performance earlier in the season, things have changed at recent events.
Mercedes now hold a decided advantage, which was apparent over the course of the Turkish Grand Prix weekend.
Red Bull Team Principal Christian Horner noted that while his cars could previously match Mercedes by running smaller wings, that's no longer the case.
Red Bull recently asked the FIA for clarification over a reported intercooler trick they believe is generating more horsepower for Mercedes.
Marko has revealed that the FIA have found nothing illegal with the engine.
"This has all been cleared up by the FIA. We have to accept what the FIA decides," he told Motorsport-Magazin.
This comes after Marko himself questioned the engine, stating it was as if Mercedes were driving with the DRS open at all times given their straight-line speed advantage.
It's time for the latest episode of the RacingNews365 podcast, with F1 journalists Dieter Rencken, Thomas Maher and Mike Seymour discussing Lewis Hamilton's strategy drama and much, much more from the Turkish Grand Prix.