[Biker]

Just to emphasise a couple of important points in Mamil's post. It takes 10 to 15 minutes for the first post injection phase, associated with retarded ignition, to increase the DPF temperature to 580 degrees. Then, as the reproduced text clearly says, this temperature must be maintained for at least a further 20 minutes. The total regeneration process takes a minimum of 30 to 35 minutes to complete, not 20. This is from the 15 May 2015 document which forms part of the workshop manual and JLR00100.

All this time, post injection is being applied inside the cylinders. Post injection is the ONLY process that causes the dilution, nothing else. When the journey stops prematurely, as statistically it must do twice as often now, because of this faulty exhaust design, post injection STOPS. Anyone still not getting this? When the journey stops - the oil dilution stops. This might be something to recall the next time you hear or read that short journeys and stopping during regeneration causes oil dilution due to a pool of excess diesel "running down" into the sump. Utter codswallop.

For what it's worth...
I have actual recorded data proof of at least 4 regens that lasts about 20-25 minutes.