Have you tried asking your dealers? There service department will surely be happy to let you know?
Anyway, a search has brought up this:
http://www.mini2.com/forum/showthrea...t=oil+filt er
and this:
http://www.mini2.com/forum/showthrea...t=oil+filt er
and this:
http://www.mini2.com/forum/showthrea...t=oil+filt er
and here: (in particular the post from Juanello)
http://www.mini2.com/forum/showthrea...t=oil+filt er
I searched for Oil Filter.
If these don't help, try PM'ing the people who seem to have done the job already asking for advice.
Paul