I went with anthracite gray using plasti-dip about 3-4 years ago because it is a very close match to the wheel well trim. Did the same on wheels and 4.6is badge. Always use a carwash, still looks like the day I did it.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas