On the Au2 I Had a bit of oil leaking above No. 3 spark plug and also at the little notch at the front of the rocker cover.
I took it to an independant mechanic (not ford dealer - even though car is under warranty).
he said it didnt need a new gasket, he said he just 'nipped' it. i dunno exactly what the details where, but its stopped leaking now.!!
This independant mechanic also helped remove alot of my suspension clunks that the ford dealer was unable to remove.