Diesel engined vehicles deliver CO2 benefits. UK Government discriminates against diesel. The motor industry today called on Government to recognise the environmental benefits offered by modern diesel engines and end the discrimination against it. Speaking at a press briefing in London, Christopher Macgowan, Chief Executive of the Society of Motor Manufacturers and Traders (SMMT), said 'It is just plain wrong to discriminate against diesel given the potential environmental benefits of ultra-low sulphur fuel, the rapid technological development of low emission diesel engines and the improved fuel efficiency that they offer.