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.

Click here for more 2008 New York auto show coverage.

[Voodoo101]

And it costs how much?

[Drpixelphd2]

Okay! So full of KRAP. This is not a clean diesel. They are using chemical technology to eliminate produced gases that exceed the govt standards. It is a clean emissions vehicle, not a clean diesel as they proclaim.

[jpm150]

<<AddBlue is a urea-based liquid that, when injected into the exhaust stream, converts 80 percent of the nitrogen oxide into ammonia.>>

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.

[ruimesquita23]

Mercedes-Benz may claim they have «the world cleanest diesel engine», but they only show numbers for nitrogen oxide.
What about other diesel particulate or carbon dioxide?

[Marc1000]

I remembers an advertisement from years ago, I think it was in the 80s. Mercedes was selling a diesel they claimed was so clean that it was the lead car in the Boston Marathon. Mercedes said that the world class runners would run their race behind the car and wouldn't even notice that the car was a diesel.

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.

[ferretboy88]

I have owned many diesel cars and trucks. None of mine ever had blue smoke coming out of the tail pipe. If every SUV and pickup truck was a diesel do you know how much oil use that would cut down? A ton. My diesel pickup truck was getting 21 miles per gallon compared to my V8 which was only getting 11. Liberals are such retards. Sell your car and ride a bike to work if you want to help the planet.

[rickallen81]

Doesn't Honda's new i-dtec diesel meet all 50 state requirements without the use of urea? I agree with what was said before that it's not really a clean diesel if it achieves it through the use of chemicals. Besides, you have to go back every year for a urea recharge. Who knows how much Benz will charge for that?

[Rick Cavaretti]

Must you resort to name calling when those around you are trying to have a technical conversation? Perhaps you suffer from the same malady as those you throw stones at.

[ssamalin]

Congratulatons to MB. This is a turning point for the environment and energy independence, not to mention a heck of a car. I just hope Volkswagen can bring the TDI next. FYI, diesel has 30% less CO2, the main greenhouse gas, and now meets very strict pollution standards that very few gas cars can. MB, you made Al Gore smile.

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