Renault says it will begin re-introducing performance into its power units for the next few races after getting all four of its cars to the finish line in the Spanish Grand Prix.

The French firm remains under-fire for its failure to introduce a competitive and reliable power unit for its Red Bull and Toro Rosso customers, but while the teams proved strong over a single lap in Barcelona, they were left vulnerable to attack under race conditions from more powerful rivals.

Indeed, Renault admits it focused on reliability in Spain by intentionally turning down the engines and limiting mileage, but having enjoyed a fairly trouble-free weekend, it will now look to turn it up again for the coming races.

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"Everyone at Viry has worked hard to recover from the disappointment of the first four races," said Cyril Abiteboul. "We needed to eliminate the issues we saw and get reliability under control before we could introduce any new specification parts.

"We had to limit mileage in some cases until we had all the necessary information, which is never ideal, but sometimes you have to take a short term hit for long term gain.

"All four cars crossed the line so we are more or less back on a level footing with reliability, and can now look to bring a bit more performance for the next races."

Red Bull's Christian Horner has urged Renault to turn its attentions to improving its power unit for 2016 suggesting it should 'use as many as 20 engines' if it has to.