BMW F1 Nurburgring Nordschleife - Nick Heidfeld onboard video (note: video is mixed footage of all 3 laps)

The 24,433 km variant was used: Nordschleife + GP Strecke: Mercedesarena/kurtzambindung (so not the full GP track).
Laptimes were 8:12, 8:30, and 7:29 (new record).
The previous record for this 24km layout was 8:06 (Jurgen Alzen, Porsche 996 Turbo VLN, at 11-6-2005).
Note: Heidfeld's 7:29 CANNOT be compared to the old records of Lauda (6:58) and Bellof (6:11), because the track is now a different length: In the days of Lauda is was 22,8 km and Bellof drove it on the 20 km layout.
Also did Heidfeld slow down at the 2 main straights, for fotoshooting. The car was modified with short gears, allowing only a topspeed of 275 km/h. They also used Brigestone Demo tires, "these have no grip", according to Heidfeld.
This video is a montage with the slow-down parts removed, and shows that Heidfeld COULD have driven a 6:40 lap that day.
BMW engineers even estimate a 5:30 lap would be possible if the restrictions would be removed. (less info)