"dennis@home" wrote in message
web.com...
On 17/04/2017 10:47, Andy Burns wrote:
Brian Gaff wrote:

Did they not develop a particulate filter some years ago, for this
problem,
or is the issue that its very costly to make and needs to be cleaned
out too
often.

They did and any diesel car under about 7 years old will have one, they
are not ideal for cars that only do short journeys as they don't get the
opportunity to "burn off" the ash they collect, they certainly do stop
the visible blue/grey clouds out the exhaust. I'm not sure what the
smallest particles the DPFs collect is, PM10 seems to be the size
complained about, and they won't stop the NOx.


I had a diesel 10 years ago that had a cat and didn't emit much in the way
of NOx and I never saw any smoke from the exhaust. I don't know why they
stopped them.

Of course there are quite a few cars about where the idiots have removed
the filters and even gone as far as replacing them with fakes to get
through the MOT. Better tests are needed to get them off the road

Nope, NOx testers that can be used by the MOT
tester have been around for a long time now.

preferably along with their drivers.

Even sillier than you usually manage.