I think both of mine (outer front boots) died before 60k miles, but I'd have to pull the file and check. CPO replaced them one at a time as they died one week apart -- each with it's own $50 deductible of course…

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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