Over the years I’ve booked in hundreds of vehicles for a DPF clean. Each customer on returning to pick up their car is softly spoken to by the boss about not using cheap diesel. He’s been in the business all of his working life, many of which he actually sold fuel, so a mild lecture from him years back convinced me of the cheap fuel pitfalls.
If people are happy to believe that all fuel is of the same standard particularly diesel, I’m more than happy for them to believe that and carry on buying it. What I find slightly strange is that they feel compelled to force that belief on me. I’ll carry on buying best fuel, It’s a great idea, but that’s purely IMHO.