No one has ever taken a deep breath and said, “Man, I wish this air was a little less clean.” Whether we like it or not, vehicle emissions regulations are not going to let up any time soon. That means ...

I've owned a diesel 2013 Volvo V40 for nearly two years and it has now covered 28,000 miles (short journeys since I have owned it). Recently the message 'soot filter blocked' came up. My local garage ...