OT Another reason the get rid of fossil fuels.

[dennis]

Rubbish. There are many trade deals where parties have to abide by human rights of some sort. The EU is just one of them.

[dennis]

What makes you think cleaning the particulate filter causes a problem?

[Andy Burns]

They need to burn out the 'ash' somewhere, typically on long higher-revving journeys, given the 50mph stretches of the M4 are where it passes through urban areas, I suppose it might help to not inject the extra diesel to superheat the DPF in those areas, but it's not as though it happens all the time the car is at motorway speeds.

[Tim Streater]

I'm just quoting this year's Reith Lecturer, one or more of whose lectures I heard on the Beeb a few weeks ago. I'll have to re-listen 'cos I can't remember the specifics. Or you could.

[Tim Streater]

Thanks for that. Downloaded and I'll have a read later.

[Tim Streater]

Erm yes, I agree. I also downloaded the following two lectures. Altogether an interesting read, so again, thanks for that link.

[harry]

Not all of them. Some have to have an additive put in the fuel now and then to clear the filter.

[dennis]

The urea solution is to reduce the NOx not clean the filter.

[harry]

Item #2

[Andy Burns]

there are companies (redex, stp, wynn's etc) selling DPF fuel additives, I've never heard of any diesel car requiring them, presumably they're for the gullible?

[Levi Jones]

Not requiring them, but they do reduce the fuel used to regenerate the filter.

No.

[Andy Burns]

A bit of extra diesel at £1.20 odd a litre, or a special additive for £10+ a bottle?

[NY]

I was just about to make that very point. Unless the additive means that the DPF will require less regeneration from now on for some time in the future, you'd be better off burning extra fuel than buying the more expensive additive.

How frequently (eg mileage or amount of fuel used) does a typical DPF need regenerating? I ask because I've never been aware of it happening when I've been driving - there's no temporary change in performance or warning light on the dashboard.

Do the RedEx etc additives have any other effect than regenerating the DPF? I think I once bought one that claimed to clean the fuel injectors of any buildup of crud - that was for my first Pug 306 (1.9 turbo diesel as opposed to 2.0 HDi) which started hiccupping on gentle acceleration, and the garage recommended a bottle of it. They were about to put in some of their own stock - and charge me more than the Halfords price, so I said I'd get it myself ;-) That was long before diesel cars had DPFs and pouches of urea - probably mid 90s.

[Levi Jones]

Its only used very service, not every fill. And doesn?t cost that either.

[Andy Burns]

£9.35, every 3rd tank it says.

[dennis]

Only if the computer is reprogrammed so it knows they are there. Otherwise it will just do its normal cycle.

Probably.

[Andy Burns]

Apparently some Pugs do have an onboard DPF fluid reservoir

[charles]

There are some cars witha second small tank of "Blue" - what ever that is.

[Levi Jones]

Just one of those additives and they claim it reduces fuel consumption and it likely does with the engines which measure the pressure across the filter and burns fuel to burn off the soot in the filter if it actually burns off the soot itself instead so that isnt triggered.

[Andy Burns]

That is to do with reducing NOx, not particulates