Mercedes-Benz claims world's cleanest diesel
The Mercedes-Benz ML320 BlueTEC was unveiled at the New York auto show.
(Credit: CNET Networks/Sarah Tew)Mercedes-Benz showed off the BlueTEC ML320 SUV at the 2008 New York auto show. According to Mercedes-Benz, its AddBlue technology makes the ML320 the world's cleanest diesel. The ML320 BlueTEC uses a turbocharged diesel 3.2-liter V-6 engine, producing 210 horsepower and 398 foot-pounds of torque. That engine is mated to a seven speed automatic transmission, giving it wide range of gear ratios appropriate for city and freeway driving. The ML320 BlueTEC represents the first use of AddBlue technology in the U.S. AddBlue is a urea-based liquid that, when injected into the exhaust stream, converts 80 percent of the nitrogen oxide into ammonia. The ML320 has a 7 gallon tank for AddBlue that needs refilling every 10,000 miles. With AddBlue, the ML320 meets the emissions requirements of all 50 states. Mercedes-Benz will follow the ML320 BlueTEC with R-Class and GL-class BlueTEC models.
You have this a bit mixed up. Urea is a form of ammonia and it is ammonia that is injected into the exhaust stream where it chemically reacts with the NOX (oxides of nitrogen) to create nitrogen and H2O. What comes out the exhaust pipe is simply nitrogen and water, which is why many engineers see this technology as a simple solution. If it released ammonia into the atmosphere, we'd be in trouble.
Also AdBlue is a trademarked name. Many other diesel makers use the same technology under the generic name of SCR, which stands for selective catalytic reduction.
What about other diesel particulate or carbon dioxide?
Of course, we all know that ten years later that car was blowing blue smoke on some Boston sidestreet. For all those who think diesels are the answer, go to France and stand on a street corner. Or Buenos Aires.
I'll be happy when diesels are clean. I won't be a believer until I see one that can survive 15 years of typical poor maintenance and still not pollute. Also, and not cost $70,000.
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