The way paint is laid down on most production cars (and I suspect on BMWs also) is you put down a base coat of solid color, followed by a metal coat, followed by a clear coat. So for silver, a base coat of light gray goes down over the entire car, the metallic coat goes on outer shell and around door openings. So I suspect you're seeing that effect here. I could be wrong, but I believe that's what you're seeing.
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