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I'm having the same issue in my 335, it started after my spark plugs were replaced. Two dealers told me it's normal.
Search for "seafoam" I'm going to try using it to clean my valves this weekend.
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2012 528XI Saphire Black
Stock for now
2007 e92 335i - Monaco Blue
Injen DCI w/ Cyba Scoop - M-Tech Rear - ///M3 Rear Lip Spoiler - ///M5 SMG Shift Knob & iDrive Knob - BMW Performance Hand Brake - BMWCCA Member
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