yay, I love when a hunch is correct.
I wonder if the tunes have overloaded the DPF (more fuel = more soot).
Hopefully you won't run into any warranty issues.
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2014 Tesla Model S 85kwh
Previous cars:
2011 335d / Deep Sea Blue / Saddle brown / sport / premium
2008 BMW 135i / 6MT
2002 Z06 Corvette
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