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I had mine in for a fouled plug (limp mode, etc etc) and it was replaced (along with coils) after numerous exchanges between my dealership and BMW NA.
Everything was covered completely under warranty - and I'm not stock.
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2018 F82 M4 ZCP
2015 F13 M6 ZCP (gone)
2013 F10 M5 (gone)
2008 E90 M3 (gone)
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