‘Talking ‘bout Regeneration’

June 30, 2014

Diesel Engine Problems

Background and problem

With the advent of modern emissions systems such as EGR valves and Diesel Particulate Filters come additional deposit problems. These deposits not only affect the efficiency of the component in question but also bring shortcomings in power, economy and emissions. Indeed the irony of the additional emissions control devices is that when they malfunction emissions are adversely affected.

The EGR and DPF are well intentioned devices that do an extremely valuable job in lowering Nox and Particulate Matter (soot) emissions….until they get clogged up themselves by the very exhaust borne emissions they are trying to control.

If we look at the DPF unit first. Its job is to reduce the amount of soot that is passed into the atmosphere. It will reduce soot by 80%. Diesel Particulate filters literally filter the soot that is being passed out of the exhaust. Eventually that filter will become ‘full’ and will need clearing.

The clearing process of a typical DPF occurs in either of 2 ways, Passive Regeneration and Active Regeneration:


Passive regeneration takes place without the driver being aware. It usually happens when the car is taken on longer runs. This gives the exhaust gases a chance to reach the very high temperatures required to initiate the process of converting the soot into a very fine ash, thus cleaning itself.


This happens when passive regeneration has not occurred (usually because of the lack of required driving) and the soot loading reaches a certain level. This is about 40-50%. Active regeneration involves the ECU adjusting the fuel injection to increase heat in the DPF. This additional heat burns off the soot and should allow regeneration to take place through further high speed driving. If that active regeneration does not take place (perhaps because high rev journey did not happen for long enough) the particulate matter (soot) will continue to build up to a point that the DPF cannot regenerate itself without some external help.

There a number of factors that create the problem such as poor fuel quality and low grade oil. The soot itself is a natural by-product of the combustion process but what exacerbates the problem is Poor combustion and Oil evaporation.

It is at this point that BG Products can help.

You may have already read about the DAIS (Diesel Air Induction Service) in a previous article. This service is a complete Air/Fuel induction and EGR cleaning service. The service introduces advanced chemistry through the air intake (or EGR valve) into the induction system.

The important thing that BG state about their chemistry is that it is formulated to survive the intense heat of the combustion chamber. By achieving this goal the chemistry enters the exhaust stream where it will clean EGR tracts and Diesel Particulate Filters.

The service is an all round deposit removal service (for ‘deposit removal’ you can read ‘performance restoration’). One 1 hour service will clean the air intake, valves, injectors, EGR Tract, piston rings and Diesel Particulate Filter.

Typical Results


Loading Pre-Service

Loading Post Service

BMW 530d



Jaguar S-Type



Many of BG’s customers can testify to the effect of this service in restoring performance and economy, and of cleaning the EGR valve.

Neil Hutchinson of Mercury cars in Brentwood says ‘We offer this service all the time as a performance restoration and DPF clean. Customers have been delighted with the results and we have seen DPF’s cleaned to 0% loading.

Andy Wright of Wright Tech in Sidcup thinks “In my 22 years experience is the most efficient tool I have come across, it cleans the induction system and cleans the DPF at the same time. I am used to people exaggerating their products worth. If anything BG seem to understate their products."


Last updated: July 8, 2014 @ 16:42 PM


BG DPF Service