You sure the interior was originally coral red? Almost looks to me like someone dyed black interior red and the dye is coming off...
Otherwise, maybe like Skyhigh said, could just be extremely dirty.
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Current: 2019 440i xDrive Gran Coupe - Alpine White, Coral Red Dakota Leather, 8AT, MSport, THP, BM3; 2015 X5 35i xDrive - Mineral White Metallic, Mocha Dakota Leather; Previous: 2015 Subaru WRX - World Rally Blue, Premium, FBO+Tune
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