Accident with the friend’s car(pleasant?)

Hello, and I had an accident with a friend’s car, with him as a passenger. We were on the way to a holiday weekend and he asked me if I could drive, because he still had to do work. There was snowfall and traffic jam, then I didn’t really pay attention to a moment and I slipped in my front man. Not fast, maybe 20 km/h, the car still has a total damage. From the friend stated value is 5000 €. My friend now wants from me n damage to his car is paid, which amounts to the value, because the estimate amounts to 13000€. Am I obliged to pay him this damage, less the residual value, after all, I was only at his express request, for the first time with his car driven? Does this not qualify as a favour? I would of course also take some of the damage myself, but before I ask him to take part, I wanted to know if this is the way it is done. upt right is. And is it worth to consult an expert?(The car has driven 310,000 kilometers) Thank you very much for the answers