with the type of driving the mondeo gets (too many short runs 3.5km) if something were to go on the DPF it'd be done by now surely, since 90K kms of ownership. Sure there have been long drives in there and perhaps that's my saviour (few hunderd K's at a time) but it's not showing any symptoms and I'm happy about that at least.
Nulon C3-12 Full Synthetic 5W-30 Diesel Formula Long Life Engine Oil is the only engine oil it's had since buying the car in 2014 with 120K on it, now at 210K. Unfortunately I have no data to back anything up so it's all anecdotal, would be nice.
I'll keep going with Nulon me thinks.