Y ou’ll no doubt have heard, for some time now, that Max Verstappen is dissatisfied in his £50m-a-year role as a Red Bull Formula 1 driver. The four-time world champion, the sport’s standout driver, was unashamedly grumpy throughout much of last season, despite his title near-miss . This year, his exasperation with F1 ’s new set of flawed engine and chassis regulations has sent him, with no bluster, to the brink of the exit door. The F1 exit door, that is; not motorsport altogether. On the contrary, Verstappen is unearthing his racing prowess and competitive instincts in fresh ways. A year ago, he set his heart on a new challenge: the infamous Nurburgring Nordschleife, a devilish 20.832km circuit in Germany’s Rhineland-Palatinate state, coined “The Green Hell” by Jackie Stewart in 1968. This weekend, he competes in the prestigious 24 Hours of the Nurburgring event. And no prizes for guessing his overarching aim. “Success is winning,” he said this week. “That's why we're here.…