And those with their DPF's removed!

Yea indeed especially since you are obliged to get at least a stage 1 remap when deleting DPF as it would be rude not to! I am really surprised that they have never thought of this a simple extra field of information to be added to their shared database could cream in millions on cars that are on upper end of their emissions band but not running at their peak and then all the modified cars.

I'm having my DPF removed as I can't afford the £1,200 if it mucks up

I'll be getting a full turbo back exhaust aswell so I'll have it stage 1 mapped as post above be rude not to

If mine was to need replacing i would just have it deleted but i wont have the much more than a year soo...will leave it for now

If it was a paper/disposable filter, that cost in the £5-£50 region I'd agree with you.

However a part that costs £1k to change, seems like it's either not suitable for the environment the car will be used in (read poor design) or a joke.

No matter what the cost its deemed a filter & as such a customer funded service item, they have a life span & that is determined to an extent by the way the car is driven. I have been told a good way to check if a car has design DPF issues is to see if the model is offered on the channel Islands by the manufacturer where slow steady driving is the only option & the traditioanl drive to clear the DPF isnt easily achieved

Edited 4 September, 201213 yr by Stuart_J

Also is it just me or does the environmentally friendly thing sound like a load of bull when they say it catches the bad stuff suit etc but then at some point it burns it out anyway releasing it into the atmosphere just at a higher concentration when it does lol

DPF is supposed to burn off the diesel particles into CO2. The only thing that might be left is a little bit of ash from some of the inorganic components of the oil. Hence DPF cars needing low ash oil. The ash can't be burnt off, so I do wonder what happens to it and if it is the limiting factor in the life of the filter.

I know BMW considers DPFs to be consumables and apparently there is a service life counter in a hidden menu within the OBC. BMW DPFs expire at about 100-120k. That was on 5-6 year old cars anyway, newer cars might be different.

Edited 4 September, 201213 yr by Aspman

DPF, Injectors (though on the PD) EGR and blocked inlets is why I went back to Petrol this time.

I'm also switching my TSi to fixed oil changes (only do 8.5K a year now) so as to hopefully per-long its life.

My old Mark 4 Golf GTi (1.8T) was on 120K when I sold it and still running like a peach.

Paul

DPF is supposed to burn off the diesel particles into CO2. The only thing that might be left is a little bit of ash from some of the inorganic components of the oil. Hence DPF cars needing low ash oil. The ash can't be burnt off, so I do wonder what happens to it and if it is the limiting factor in the life of the filter.

The ash remains in the DPF for ever and yes it is the amount of ash that the DPF can hold that determines its life.

The ash remains in the DPF for ever and yes it is the amount of ash that the DPF can hold that determines its life.

Not sure thats true

Vw say

With passive regeneration, the carbon soot particles are burnt off continually without intervention from the engine

management system. The particulate filter is positioned in close proximity to the engine. This assures that exhaust

gas temperatures of 350-500 °C are reached on motorways, for example. The carbon soot particles are thereby

converted into carbon dioxide by a reaction with nitrogen oxide. This gradual process occurs slowly and continually

through the platinum coating, which works as a catalyst

Most of the soot is turned into carbon dioxide but not all of it.

As mentioned a little earlier there are some components of the engine oil that cannot be burnt off completely, this is what is referred to as the ash - hence the requirement for DPF equipped cars to use the longlife low-ash oil so as the maximise the capacity of the DPF.