The Scudo never used the it but had to change most of the top end as they are very different. I remember?
The case in 2012 seems to suggest it is quit a rare occurrence on this engine and the post goes onto say that the car did stop itself. I looked at the 1.3 manifold and there is indeed a butterfly valve which cuts the air to the engine when it is switched off so this would all seem to suggest that in that 2012 case runaway started but the engine did stop rather than the pistons flying around the building.
That case is quite interesting. DannyBoy who posted on there was a Fiat Tech and pointed out that constant over fueling and failed regens leads to engine damage, he pointed out that the car he was involved with spun a bearing shell on the crank shaft because with all that diesel getting in the oil the oil was useless at protecting the engine.
Diesel is essentially a good cleaning solvent, so that makes sense I suppose.
He also posts about the oil condition warning coming on and the garages just resetting it without an oil change also leading to these kind of problems.
In this thread I think the car in question potentially sits in the same mechanical situation as the example dannyboy gave, sounds like it has been run a lot, with a lot of diesel in the oil. It is certainly possible that the engine is badly damaged or verging on it. The issue is does the OP was to spend a thousand euros on a DPF only to find out the engine is toast.
Conversely if the OP has now managed to perform a full regen and got the clog down to 85% the care may now be happy that it has successfully completed a regen and stop dumping gallons of fuel into the oil.
Maybe the right course of action at the moment is to change the oil again to get rid of the diesel. Then just use the car and see if any of the regen issues, or fuel accumulating in the oil occurs again. so Service the car, then just watch what happens next.