New MOT Diesel Emissions

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  • Apodemus
    Apodemus Posts: 3,384 Forumite
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    edited 12 October 2018 at 7:50AM
    My 59 plate, no DPF, 2.2 litre diesel passed its MOT yesterday, with no advisories. Exhaust is clean right up through the usual rev range, despite having over 100k miles on the clock. Not sure what revs they take it up to on the test, but I’d agree that for a well-maintained diesel, the current MOT rules should not be a problem.
  • sevenhills
    sevenhills Posts: 5,874 Forumite
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    edited 12 October 2018 at 6:07PM
    Apodemus wrote: »
    My 59 plate, no DPF, 2.2 litre diesel passed its MOT yesterday, with no advisories. Exhaust is clean right up through the usual rev range, despite having over 100k miles on the clock. Not sure what revs they take it up to on the test, but I’d agree that for a well-maintained diesel, the current MOT rules should not be a problem.


    Euro 5 (2009/9) for light passenger and commercial vehicles; if it has no DPF does it have adblue?
    Or are you saying it have been removed? I would have expected a EURO 5 to be quite a low emmissions vehicle, maybe its a EURO 4.
  • LandyAndy
    LandyAndy Posts: 26,377 Forumite
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    My car, 2009, 2.2l with DPF, 154,000 miles, passed with no issue just after the new regulations were introduced.
  • AdrianC
    AdrianC Posts: 42,189 Forumite
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    sevenhills wrote: »
    Euro 5 (2009/9) for light passenger and commercial vehicles; if it has no DPFdoes it have adblue?
    Or are you saying it have been removed? I would have expected a EURO 5 to be quite a low emmissions vehicle, maybe its a EURO 4.
    Euro5 (like all the other limits) doesn't actually mandate specific equipment. It simply sets a level that may or may not be possible to achieve without.

    The main changes from Euro4 to Euro5 for diesels were a reduction in NOx from 0.25g/km to 0.18g/km... and a reduction in particulates from 0.025g/km to 0.005g/km. HUGE reduction there, which is why most manufacturers decided DPFs were needed - but not all.
  • Apodemus
    Apodemus Posts: 3,384 Forumite
    First Anniversary Name Dropper First Post Combo Breaker
    sevenhills wrote: »
    Euro 5 (2009/9) for light passenger and commercial vehicles; if it has no DPFdoes it have adblue?
    Or are you saying it have been removed? I would have expected a EURO 5 to be quite a low emmissions vehicle, maybe its a EURO 4.

    It’s a Euro 4.
  • Nodding_Donkey
    Nodding_Donkey Posts: 2,738 Forumite
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    Nasqueron wrote: »
    and keep on pumping out gunk.


    You realise that diesels with a dpf still pump out the gunk don't you.


    Just they do it all in one go when 'regenerating'.


    Biggest con ever.
  • AdrianC
    AdrianC Posts: 42,189 Forumite
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    Nodding_Donkey wrote: »
    You realise that diesels with a dpf still pump out the gunk don't you.

    Just they do it all in one go when 'regenerating'.

    Biggest con ever.
    No, not really. The particulates are burnt at a higher temperature, and disposed of in a less harmful ash form, rather than emitted as particulates.

    If they were just "pumped out" in "one go", you'd know instantly when a DPF car was regenerating, because it'd be...
    maxresdefault.jpg


    (Some American pick'em'up drivers think this is laudable, and deliberately turn the fuelling up to do it. They call it "rollin' coal"...)
  • sevenhills
    sevenhills Posts: 5,874 Forumite
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    AdrianC wrote: »
    No, not really. The particulates are burnt at a higher temperature, and disposed of in a less harmful ash form, rather than emitted as particulates.


    And there is also the Adblue, in which the particulates are mixed with water vapour and fall to the ground instead of being breathed in.
  • AdrianC
    AdrianC Posts: 42,189 Forumite
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    sevenhills wrote: »
    And there is also the Adblue, in which the particulates are mixed with water vapour and fall to the ground instead of being breathed in.
    Umm, no.

    AdBlue - urea - is used in a catalytic reaction to convert NOx emissions into nitrogen, water vapour and CO2. It's nothing to do with particulates.
  • sevenhills
    sevenhills Posts: 5,874 Forumite
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    AdrianC wrote: »
    Umm, no.

    AdBlue - urea - is used in a catalytic reaction to convert NOx emissions into nitrogen, water vapour and CO2. It's nothing to do with particulates.


    To put it another way, Adblue is sprayed as a fine mist into the exhaust gases and makes the harmful diesel emissions heavier than air stopping them floating around when emmitted out of the exhaust pipe.
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