Its actually the regeneration mapping / phase that burns off the soot in the DPF filter with the High pressure injection which is utilised to inject fuel into the exhaust gasses during the post injection period. This casues the temperature to increase to a high enough level to oxidise particles in the filter leaving and ash residue and the Eolys Cerium based fluid assits and increases the efficiency of this process. This is ECU controlled.
not quite right. The eolys in fact makes it possible that the combustion of the particles can take place at 450°C instead of 650°C. Therefore lowering the amount of energy and time necessary to clean out the DPF.
As I understood, in the new 1.6hdi they have abandoned the eolys and have started to use the normal self cleaning dpf system... but I may be wrong on that one.