Zafiro
Supreme Roadmaster
This is just a wild guess from my side but I don't think they are trying for the N-ring laprecord. I think it's a suspension test in general. N-ring is a complex track and a great place to try/adjust and to try out various suspension settings for roads outside a track.Very encouraging for the 2 or 3 people who actually track 5 series sedans!
...but again this is just me throwing a wild guess that you already know about this