Renault says it will work in 'full consultation' with Red Bull and Toro Rosso on whether either team opts for the updated power unit in Austin.

Despite the fractious relationship between the French manufacturer and the teams, which is due to an end once the 2015 Formula 1 season comes to a close, Renault has confirmed it is committed to providing a professional performance over the final four races of the year.

Renault says it will make the new spec power unit available to its customer teams for the US Grand Prix with improvements made on the ICE to provide greater power and energy efficiency. However, if Red Bull or Toro Rosso do select to run the new engine it will receive a hefty grid penalty.

Related Articles

Therefore, Renault will work with both teams to weigh up the positives against the negatives to make an informed decision.

"We will have our new specification of power unit available to use in Austin," Renault's director of operations, Remi Taffin, said. "The principal changes involve the internals of the ICE to give improved power and efficiency. We know that introducing the new PU will incur a grid penalty so the decision to use will be made in full consultation with the teams. At this point of the season obviously points are crucial so if circumstances allow then we will use on track."

Taffin also believes Renault has made significant improvements in recent weeks with its reliability and is hoping for a trouble-free race weekend to demonstrate its true potential.

"Whatever spec we do use, we are looking forward to Austin," he said. "Our reliability has been good in the last three races and performance more in line with our expectations; both our teams just need a clean weekend to show the improved potential of both packages."