[cfg83]

UFO -

Originally Posted by UFO

@Old Tele man -- No, Dave is correct. The VW diesels with DPF do not use the urea for NOx treatment.

It looks like 2012 VW TDIs will have the urea injection system (in place of the DPF?!?!?) :

2012 VW Passat 101: What you need to know

FUEL ECONOMY
2.5L 170-hp engine, 31 mpg highway and 573 miles/tank
3.6L 280-hp engine, 28 mpg highway and 518 miles/tank
2.0L TDI Clean Diesel, 43 mpg highway and 795 miles/tank
Figures are manufacturer estimates.
...
TDI CLEAN DIESEL: We know what you’re thinking. Diesel used to be smelly, loud and nasty, and as a result got a bad rap in the states thanks to big trucks and long-ago mistakes by automakers. It’s just not true anymore, so – get over it. Today’s diesel is clean, thanks to the fuel and engine technology that VW uses to help improve efficiency and boost performance.† Fact is, TDI Clean Diesel models are arguably better and more efficient than their gasoline-powered siblings. There’s also the feel-good angle: the 2012 VW Passat TDI meets BIN5/LEV2 emissions standards, courtesy of a computer-controlled injection system that sprays fuel directly into the combustion chamber. At high pressure, this helps to promote more complete combustion. In addition, 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. Service is handled at your local VW dealership and is covered by the Passat model’s no-charge Carefree Maintenance Program.

CarloSW2