After having run diesels for over twenty years I have returned to a petrol engined car. My reasons for this switch has come about because of the bills I have paid repairing a euro4 engine. Over the last two years and approximately 12000 miles I have had the MAF fail, throttle body failure, EGR valve removed and cleaned, and final straw was when the swirl system failed. All these components are fitted to achieve ever decreasing emissions. Each time one of these components failed it put the car into limp mode and involved an expensive visit to main dealer for said repairs. Now VW and other manufacturers have been caught out failing to meet emission requirements, and using software tweaks to pass, I personally don't believe these exacting requirements can be achieved without such software or high failure rates of DPF's, regeneration systems etc etc. What say you?