the dpf "collects" soot when you are in town doing little revs and then "releasing the crap" when you are gunning it along the mtoorways and A roads

so as long as you give it beans (we have been told by vauxhall to give our vans at least a 30 second thrash in 2nd once a day to clear out their dpf's) regularly it shoudln't be an issue

if you drive it like a taxi driver though, you'll be fucked

as for mac 247, i would probably expect one of the ford technicians to go out and give it a good ragging and clear it out as that's what the vx techs do