John Ranalletta 
2011 BMW 3 Series Diesel 335d 4dr Sedan (3.0L 6cyl Turbodiesel 6A)
Diesel Exhaust Tech not ready for prime time
 I've driven this '11 335d for nearly 5 years and 100k miles.  I love the car but not when the service engine soon light turns on.  Usually, it's a fault related to the SCR (diesel exhaust fluid) system issue.  Having purchased the 100k BMW warranty, the repairs were covered, except for replacement of the catalytic converter which the dealer stated was not covered.  I have to pay $500 labor and the dealer is providing the part.  This is not an inexpensive car to own/maintain and I'd likely not buy another BMW diesel even though there's a lot to like about driving one.