there is a video on you tube which shows a smoking engine onthe smax diesel. i have the same problem and a friend had the same - all 2.2 diesels. there is a thread on here but no responses.
my friend had his repaired under warranty. the video I don't know and mine - i ignore! ours was/is oil related.
ford have refused to say they have a design fault funnily enough but i think it is a fairly common problem...
did you get to the bottom of yours?