Does AdBlue degrade?

Can you store a part used container of AdBlue in its original sealed container indefinitely in your garage or shed, or does it over time 'go stale' like petrol?

Is all AdBlue the same?

I have a 2016 VW Touareg Escape with an Ad Blue tank. When I bought the car I had no experience of this AdBlue stuff. There is no way to check the tank other than push a dry stick in. It appeared to...

Are diesel DPFs evolving to the point where problems are disappearing?

I was interested to read your recent comments about certain vehicle models appearing to be DPF trouble-free. Is this because they have markedly different systems for regeneration of the filter, or some...