I no longer have my 09 JCW but I do recall that the expansion tank is in the way. However I just kept a rag under it to catch the coolant drip from moving it out of the way and then it was easy to get to the filter.
Have you seen this how-to from the library? R56 Oil Service - Library
I would think it would be same for a 2012.
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Thanks for the directions to the how to. The problem I had with my first oil change is that the hoses connected to the expansion tank have absolutely no play. I can only swing the expansion tank upwards by about 6 to 8 inches. My hands are enormous! It is really tough to get in there.
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Ernesto Club Coordinator
Is the space problem a Cooper S thing? I did my 2012 Cooper Clubman and got to the filter housing without moving stuff..
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Crashton Club Coordinator
Yes on the S the turbo is the issue. On a Justa R56 the filter is right there for an easy oil change.
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Did an oil change for the first on my 2010 Cooper S and I must agree the expansion tank hoses don't allow much movement. Twisting the tank slightly and moving it to the left does allow good access to the oil filter. Mind you in twisting the hose some coolant drips from the fitting but that stops as soon as the tank is repositioned correctly. BTW I used Liqui Moly 5W40 and about 20% Lucas Synthetic and this 93k engine has quietened down substantially.