Red Bull growing increasingly frustrated with Renault?

Sebastian Vettel zips around the Circuit of the Americas in Texas during qualifying for the United States Grand Prix on November 16, 2013
© Getty Images
Red Bull are reportedly becoming increasingly frustrated with Renault and are considering other options due to the problems in their power unit.

The Red Bull Formula 1 team are reportedly considering alternatives to Renault due to issues with their power unit.

While the team have appeared to recover from the problems that dominated pre-season testing, adviser Dr Helmut Marko is said to have claimed that the unit is not up to scratch.

According to Bild, the reigning constructors' champions are considering other options should their issues with Renault not be resolved.

Red Bull are currently sixth in the standings following races in Melbourne and Malaysia.

Fernando Alonso sits in his team's pit on November 23, 2012
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