Spark Plug: Platinum Middle Electrode. Spark Plug. Spark Position [mm]: 4.8. 3 Convertible (E93) M3 420HP/309KW 2008/03-2013/10. 3 Coupe (E92) M3 420HP/309KW 2007/06-2013/06. 6 Convertible (E64) M6 507HP/373KW 2006/09-2010/08.
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