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At the upcoming 2008 New York International Auto Show , Mercedes-Benz will showcase its growing range of SUVs and three-row people movers. Freshened styling on the M-Class may stand out in pictures, but it is what’s under the hood that makes the 2009 M-, G-, and R-Class models worth a closer look. We all knew it was coming, but the clean-diesel BlueTec engine arrives in the Big Apple ready to meet 50-state emissions limits, thanks to a new AdBlue exhaust treatment system. The BlueTec engine promises 20-30 percent better fuel economy than equivalent gasoline engines, surprisingly good performance, and low exhaust emissions. With the added fuel economy, the BlueTec equipped models have up to 600 miles cruising range. The BlueTec diesels use an NOx storage catalytic converter in combination with an SCR catalytic converter and AdBlue injection to lower NOx emissions. The AdBlue system injects an aqueous urea solution into the exhaust flow, which releases ammonia (NH3), reducing nitrogen oxides to harmless nitrogen and water in the downstream SCR catalytic converter. The AdBlue tank needs to be refilled every 10,000 miles during routine maintenance intervals. At a time when consumers are...
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