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Any chance you are losing coolant or adding coolant every month or so? Although I would not describe my issue as rotten eggs, but I was "consuming coolant" and eventually the burn off from the leak presented itself as a nose burning and eye watering smell from the vents. When the car was moving, not so bad, when stopped, it was the worst.
Had the turbo coolant lines upgraded under warranty.
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2018 M550ix|Carbon Black|Dinan Modifications|2003 540i|Jet Black|M-Sport|2021 X5 Mineral White
Prior BMW's: 1987 325e|1993 740i|1998 740il|2001 530i|2002 745li|2007 750li|2006 750li|2001 530i|2012 535xi|
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