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...

Have you noticed a rising oil level in the Mazda 6 due to a DPF fault?

I notice you were yet to be made aware of any DPF issues with Mazda Skyactiv diesels so I thought you might like see the attached which comes from the May 2013 issue of Diesel Car. Are you seeing any evidence...