Dennis:
Yes, the oil filter assembly can be reached form the top, behind the engine. And yes, a 36 mm sochet, extension w/ ratchet fits. You may not even need the socket to remove the filter assembly, I was able to remove it by hand, but if yours feels a little too tight to loose it by hand, then use the socket/rachet. The oil plug gasket is reusable. If you damage it, then repleace it, but it is totally reusable.
Erazo:
I bought my oil filter directly from the MINI dealer. I just did not want to take chances by using any other after-market brands. Besides, I don't even know of any of those suppliers. The cost of one genuine MINI oil filter was $9.81 + tax.
Good luck!
