Comment Re:"Clean diesel is here to stay" (Score 1) 998
The current Volkswagen TDI's for instance, are 50 state legal (including CA), and don't require urea.
Low sulfur is nice, but that doesn't affect NOx, which is what the urea is intended to take care of. According to VW, the 2012 Passat TDI models "use a special catalyst and urea-injection system that reduces NOx emissions by up to 95 percent. Filled by a 4.9 gallon tank located inside the trunk, the injection system delivers a range of approximately 15,500 miles."
So as you can see, current TDIs do require urea, and the tank will need to be refilled multiple times over the life of the car.