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March 24, 2008 2:15 PM PDT

Mercedes-Benz bills its ML320 BlueTec as the cleanest diesel in the world. It uses AddBlue technology, a urea solution which, when injected into the exhaust stream, converts nitrogen oxides into ammonia. Mercedes-Benz will also launch BlueTec versions of its R-Class and GL-Class.

Credit: CNET Networks

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