What sort of milage and speeds you doing ?
They recon 50 mph+ for 20/30 minuits to complete a regen, if you are doing less than that it's possible regens are failing as you shut the engine off before they complete and excess diesel is getting into the sump.
I have only known my D5 to regen once, after a prolonged period of short trips while the landrover was off the road. In usual running it goes 20 miles each way at least and gets a regular run of an hour + at motorway speeds to visit the grandkids which seems to keep it clear.
Paul.
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