Interested in this kind of news? Receive them directly in your inbox. Delivered once a week. Sign Up They also emit 10 times more than new diesel engines. For years diesel engines were associated with much higher levels of particles than petrol. T&E clean cars programme manager Greg Archer said: ‘Direct-injection petrol engines would be a great innovation if they didn’t emit harmful particles, yet these particles can be eliminated without any loss of fuel-efficiency for around €50 per vehicle, the price of a hands-free kit. It’s time for carmakers to become more responsible and fit these filters as standard.’ Under EU law, such filters are obligatory for diesel engines but not for petrol engines.