BlueTec

BlueTec is Daimler AG's name for its two nitrogen oxide (NOx) reducing systems, for use in their Diesel automobile engines. One is a urea-based reductant called AdBlue, the other is called DeNOx and uses an oxidizing catalytic converter and particulate filter combined with other NOx reducing systems. Both systems are designed to reduce pollutant emissions.
The BlueTec was on the Ward's 10 Best Engines list for 2007.

Some Resourceful links :

1.http://en.wikipedia.org/wiki/BlueTec

2.http://www.worldcarfans.com/5061213.001/8

3.http://www.mercedes-benz.com/content/mbcom/international/international_website/en/com/Mercedes-Benz_Brand_Galery_BLUETEC.html

4.http://cars.about.com/od/thingsyouneedtoknow/a/ag_BLUETEC.htm

5.http://www.greencarsite.co.uk/GREENNEWS/mercedes-bluetec.htm