Rundstrecken Challenge Nürburgring

The Rundstrecken Challenge Nürburgring (RCN) (circuit racing challenge Nürburgring) previously known as Castrol-HAUGG-Cup (CHC), is a motorsport event series. Being run since the early 1960s mainly on the Nürburgring, it is regarded as Germany's oldest touring car racing series.

Source: Wikipedia — Rundstrecken Challenge Nürburgring (CC BY-SA 4.0)