I bought a used BMW M4 only to find out it was used as for track days - where do I stand?

I purchased a BMW M4 from my local main dealer last week and after paying a deposit I was advised (salesman said they were obligated to) that the car had been used for track days by BMW UK. I had asked...

Which luxury car is the wisest financial decision - Ferrari, Bentley or Aston Martin?

In early 2013, I bought a new BMW 640d M Sport Gran Coupe. I part exchanged it two years later for a new BMW M4. That cost me £32,000 in depreciation. I'm now thinking of selling my M4 at the three year...

fuel grades

I use Shell Nitro unleaded in my M4, what is the equivalent grade for Esso, BP and Texaco please (on the assumption that I cannot find a Shell station)?