Are you running the new 'hi-tech' 5w-40 lubrimoly oil that meets the LL-01 spec? If not, try it at your next change. It really quieted down my N62. Maybe it'll help your M62.

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Kirk
Las Vegas
2016 X5 40e Mineral White/Black Dakota Leather, ZLL, ZCW, ZDA, ZDB, ZPP, multi contour seats, rear side window shades, HK stereo
2011 E90M3, 6-speed manual