Good info in this thread. Will keep that in mind for upcoming spark plug change. (is it at 60k miles? if so, I am almost there.)

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Currently driving: 2011 E70 x35i , 2011 E90 335d
Previous BMWs: 2007 E90 328i , 2005 E53 3.0i, 2011 F10 535i (6spd manual)