Audi still leads the Nürburgring 24, as the German race reached the halfway mark at 4 a.m.
The No. 28 Audi Sport Team WRT Audi R8 LMS of Christopher Mies, Edward Sandström, Nico Müller and Laurens Vanthoor holds a two-minute lead over the No. 44 Falken Motorsports Porsche 911 GT3 R in second overall.
The two BMW Sports Trophy Team Marc VDS BMW Z4 GT3s were third and fourth as the race reached the halfway mark.
2014 race winners Christopher Haase, Christian Mamerow, Rene Rast and Markus Winkelhock in the he No. 1 Audi R8 LMS had been leading through the night, before crashing out at Pflanzgarten in the tenth hour of the race.
Mamerow was taken to the medical center for routine checks, while the badly damaged Audi was taken back to the paddock on a flatbed.
A rain shower early in the eighth hour caused chaos, with several cars crashing into the barriers.
Patrick Pilet, driving the No. 30 Frikadelli Racing Porsche 911 GT3 R, crashed at Karussel after contact with the No. 31 Car Collection Mercedes.
The race continued with a long yellow zone, allowing barrier repairs between Karussell and Hohe Acht to be completed.
Just after 3 a.m. the No. 25 BMW Sports Trophy Team Marc VDS BMW Z4 GT3 moved into the lead for the first time, before handing back the lead to the No. 1 Audi as it pitted.
The No. 84 Bentley Continental GT3 retired after spinning into the barriers in changing conditions, while the No. 2 Black Falcon Racing and No. 22 Rowe Racing Mercedes SLS AMG GT3s were also retired.
Right at the end of the twelfth hour the No. 7 Aston Martin Vantage went off track, with Stefan Mücke hitting a patch of oil on the track.