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I have a 2013 28 sdrive with M Sport and it's as steady as a rail car at over 100. I would guess tires, All Seasons vs Summer performance, over inflated, alignment? I would check how the tires are wearing, are the insides or outsides wearing faster. I've never had a BMW that wasn't extremely steady at 100 plus and I'm on No. 15 plus a Mini.
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1995 325i, 1996 328ci, 1997 528i, 1997 Z3 2.8, 2000 528i, 2001 X5 3.0, 2001 330i Convertible, 2002 M3 Convertible, 2003 M3 Coupe, 2004 M3 Coupe, 2004 Z4 3.0, 2004 X3 3.0, 2007 X3 3.0, 2007 335i Convertible, 2013 X1 28 sdrive, 2014 M235 manual, 2020 X3 30i Xdrive
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