I bought a 2011 (from the UK) which is the equivalent of your 12k....as per the above post, as long as servicing, recalls etc are done properly then nothing to worry about...
Ive had no issues with mine other than the occasional drivetrain error which has been fixed underwarranty from BMW with no ongoing issues. Dont think there is such a thing as a bad year but there are some problem M5s around with no apparent reasons as to why...As long as you have warranty I wouldnt worry at all
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