I have a CPO 2011 X5 35i and when I got it from Chapman BMW in Phoenix I noticed it had a bunch of criss crossing cracks on the top of each headlight lens I didn't say anything at the time cause I was just happy to get a good deal on the X5.
I live in Tucson so I go to BMW of Tucson and I did take it there to have them evaluate them for warranty replacement. At first they thought I scratched them myself but when I pointed out the unusual way they look they decided they will replace them under warranty..
I'm pretty happy about them taking care of this and when I googled the issue I found a lot of people have this same problem, might be worth taking it in to see what your dealer will do for you...
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