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Audi's Loic Duval, Lucas di Grassi and newcomer Oliver Jarvis have opened up the 2015 FIA World Endurance Championship curtain raiser with the fastest time in FP1 for the Silverstone 6 Hours.

The first official sessions for the eight-round endurance series, Audi commanded the top spot for much of the 90 minutes, with the #7 R18 e-tron of Marcel Fassler, Andre Lotterer and Benoit Treluyer leading the way initially.

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However, as Audi begins the season without the #1 plate for the first time, the #8 car driven by di Grassi would hit the front with a best time of 1min 42.121secs, putting it a tenth clear of the leading Porsche of Mark Webber, Brendon Hartley and Timo Bernhard.

With the #8 Audi settling in third, the #18 Porsche 919 Hybrid of Neel Jani, Romain Dumas and Marc Lieb made late gains in fourth place having missed part of the session with driveshaft problems, leaving defending champions Toyota in fifth and sixth position, albeit still in range of the top time.

Though Nissan has delayed the race debut of its much anticipated GT-R Nismo LMP1 machine until Le Mans, the manufacturer was still the engine of choice in LMP2, locking out the top four positions, with the two G-Drive entries - headed by Gustavo Yacaman - leading the new KCMG Oreca and the incoming Signatech Alpine.

A closely matched GT class, meanwhile, was headed by the Aston Martin of the new all-Danish line-up of Marco Sorensen, Nicki Thiim and Christoffer Nygaard, albeit with less than a second covering all eight GTE Pro cars. The GTE Am class was headed by the Proton-Abu Dhabi Porsche