One thing to consider is that although it's the top of the wheel where you don't touch when driving straight, you are frequently turning the steering wheel and eventually your hand will touch about every surface of the leather at some point. It could have happened while turning.
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2016 F82 M4 / AW/SO - Current
2013 E92 M3 ZCP / SG/FR - Sold
2008 E92 M3 / AW/FR - RIP
2008 335xi Coupe / JB/CR - Sold
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