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Stock Problems/IssuesDiscussions related to warranty related issues and repairs, or other problems with the OEM parts and software for MINI Clubman (R55), Cooper and Cooper S(R56), and Cabrio (R57).
Yep, mine did that also when i spilled it once. Pop that front cover off and clean up the oil. Then drive and check it later. If its still leaks you have a cracked cover: N12/N16 valve cover in this thread.
I noticed a leak just like this a while ago and remembered a few months before that when adding oil to the engine the rubber seal under the oil filler cap slipped off. I put it back on but maybe not correctly. I removed the cap again and made sure that the rubber seal was seated correctly in the cap, then put it back on and cleaned up the oil. No more leakage since.