mine runs quieter on the liqui-moly 5w-40 (BMW LL-01) than the 5w-30 castrol.

I used the ZF Lifeguard -6 fluid when I did a partial flush.

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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