Are DPF’s worth the trouble after class action against JLR

Research shows that DPF’s maybe less than adequate

According to recent research conducted at the University of Birmingham under the direction of Professor Roy Harrison, filters intended to stop the emission of particulate matter from car exhausts fall short in stopping the emission of ultrafine particles.

The Department of Transport had the following to say about the filter, which was made a mandate for new vehicles starting in 2011 and lorries starting in 2013: ‘Diesel particulate filters (DPF) are devices fitted to diesel vehicles which filter particulate matter from exhaust gases. Diesel particulate filters perform an essential role in reducing air pollution and its health effects, their removal is almost always illegal.’

Experiments revealed that while the filters were effective at removing bigger particulate matter, smaller liquid particles were more difficult to stop.

Compared to the 10 m and 2.5 m particles we typically talk about, ultrafine particles are particles with a size smaller than 0.1 m. The World Health Organisation determined in June 2012 that ultrafine diesel engine emissions are carcinogenic and the main cause of premature death from environmental causes. They are a by-product of the incomplete combustion of organic materials, such as wood and diesel. They share the same risk category as asbestos and arsenic, both of which have long been outlawed in the EU.

The researchers looked at data from a Marylebone Road, London, monitoring station that has been collecting air quality samples since 2010. Larger particles, including black carbon, showed a sharp drop between 2014 and 2021, declining by 81%.

Professor Harrison, said: ‘Our research shows clearly that current, widely-used filters are not effective against these smaller particles and we welcome recommendations from the World Health Organisation that surveillance of these measurements increase and note with concern that current concentrations measured in London are classified as ‘high’.

‘High concentrations of ultrafine particles are likely to be a widespread and persistent phenomenon. In order to meet WHO guidelines we are likely to need a much higher uptake of electric vehicles, as well as additional measures to reduce emissions from diesel vehicles.’

Adding to this, in a collective action filed in the High Court of England and Wales against Jaguar Land Rover, the business owes its clients almost £3 billion as a result of flaws in key components, including the exhaust filters in a variety of their diesel vehicles.

According to the allegation, vehicles with faulty DPF systems require servicing more frequently than was anticipated at the time of purchase, among other reasons because the system accelerates oil dilution, which leads to engine component wear. Additionally, it leads to the necessity for more regular oil changes for the car.

When the DPF is full or clogged, the vehicle enters “limp mode,” which makes it slower and less responsive, raising the possibility of an accident and endangering both the driver and other road users.

Sources London Post and

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