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I would not be against using Liquimoly/Lubromoly motor flush or other well regarded brand name flush (i.e., not marvel's mystery oil or other nonsense -- they have their place and it isn't in our motors). BG chemicals makes good stuff too.
Change the oil at 2x the intervals indicated by the lights if you want to keep things nice and clean.
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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
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