In October 2008, Daimler's new range of Mercedes BlueTEC light-duty diesel vehicles were awarded the "Qualified Alternative Motor Vehicle Credit" by the US Internal Revenue Service (IRS) which qualifies buyers for up to $1,800 of tax credits, a status previously only granted to hybrid-electric vehicles. To qualify for the award Mercedes-Benz BlueTEC range underwent assessment by the US Environmental Protection Agency (EPA). BlueTEC was created by Daimler as a brand name for cars, SUVs and heavy-duty trucks and buses which employ NOx treatment systems, including SCR. The Mercedes SUVs to employ SCR are the GL320 CDI, ML320 CDI and R320 CDI. The vehicles, which are the first diesel passenger vehicles to meet 50 state emissions requirements, went on sale on October 1st 2008.

http://www4.mercedes-benz.com/specials/scr/en/index_nocom_en.htm