Mark Webber believes Porsche's biggest challenge will be surviving the full race distance at Le Mans and says the prestigious endurance event 'is like nothing else'.

The former Formula 1 star is gearing up for his fourth time at the Le Mans 24 Hour race but has never achieved a classified finish in his previous three attempts, something which he feels must change in 2015.

In 1998 and 1999 the Australian competed for the AMG-Mercedes outfit but on both occasions failed to finish. Last year Webber was part of the all-new Porsche line up in the LMP1 category alongside Brendon Hartley and Timo Bernhard but their 919 Hybrid machine struggled with gearbox problems in the final couple of hours which dropped them out of the running.

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"Le Mans is brutal and requires an amazing team effort," Webber said. "The biggest challenger you have to fight is the race itself. We have to survive these 24 hours, we have to be technically reliable and get everything right. It is extremely demanding."

Webber is fully aware that his Porsche LMP1 machine has the outright pace to challenge for the race win after ending the Le Mans test day on top of the timesheet.

On a single lap the German manufacturer appears to have an edge on its rivals but the Australian feels it will count for little unless the team can sustain it over the 24 hour race.

"The track is incredibly quick and the pace of the 919 around there is phenomenal," he added. "There are some really iconic locations around the track like Dunlop, the Mulsanne straight and the Porsche Esses.

"There are different phases of the race and the changing light; sunset, twilight, racing in the dark before dawn, sunrise and a new day with still a long way to go. Le Mans is like nothing else."