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      04-17-2024, 06:59 PM   #10
Redd
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Drives: 2010 BMW E92 M3 Dakar Edition
Join Date: Jul 2015
Location: Malaysia

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Looks like a slightly worn off or unevenly applied oil coating. I wouldn't worry about it and just use as is. If it worries you give it a spray of brake cleaner.
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