Suggest you check your oil, but not sure if fords push unused diesel into the sump in case of failed regeneration. I think your problems are more to do with the diesel particulate filter and/or egr maf. the clue for me is 8000 miles in a long period Short runs perhaps? in a diesel.
easy enough to check if the clutch slipping, i am sure someone more competent than me can tell you how exactly, but in gear, hand brake ON and release clutch with foot also giving a few revs..... but any indy will soon check the clutch for you and may only charge you a tenner or so for the opinion. if in doubt go to national tyres/kwikfit/mr clutch and they will have alook and you can get a quote, but there is more to it as you won;t get an error message for clutch slip on a fiesta.
also check technical here and the fiesta forums...
Good luck
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