It is not a mechanical flaw. Carboned up valves are the norm for DI motors no mater the manufacturer. I would like to know how your dealer knows what Satan's butthole looks like. Maybe another dealer would know what Peter Pan's butthole looks like.
2017 M2 - Alpine White - Black/Blue Dakota | DCT | Executive Package
2009 335i Coupe - LBM - Black Dakota/Glacier aluminum - 6spd | Nav | M-Sport | Premium | Logic7 | Heated Seats | CA |BMW Performance Suspension/M3 control arms| Sold
2009 X5 3.0 - Sold
07 X3 - Sold
07 335 coupe - sold