All I have noted on high mileage direct injection engines is a tendency for the back of the inlet valves to coke up. The engines have been shown to be good forr 150k in torture tests.
A concern might be whether a turbocharger might fail at high mileages, but again, I've heard of relatively few issues.
In the main, I don't think that the majority of B Maxers do a huge mileage, but i do read the focus and fiesta forums and satisfaction levels with this engine seem very high.Edited by: cianpars