Mercedes' ultra-clean BlueTEC diesels will appear in M, GL and R-Class models for 2009

Mercedes' 50 state-compliant BlueTEC diesel engines are expanding quickly across the lineup, with availability in the M-Class, GL-Class and R-Class coming for '09. The M-Class is the most notable of the new 320 BlueTEC-equipped models, thanks to a design freshening for 2009. The M's face is slightly revised, and the interior redrawn for a more distinctive look. There's also a new rear-seat entertainment system.

The 3.2 liter turbodiesel V6 that powers the ML320, R320 and GL BlueTEC models makes 210 horsepower and 398 pound-feet torque. Even in the heavy GL, that means 24-mpg performance that represents a 20-40% boost in fuel economy over comparable gasoline powered models. Revisions to the 3.2 turbodiesel V6 for the SUVs include a lowered compression ratio, a remapped ECU and revised turbocharger. Seven-speed automatic transmissions are standard in all three. Most important for Mercedes, the new BlueTEC system offers a significant reduction in NOx emissions. AdBlue Selective Catalytic Reduction (SCR) injection is used in the three sport-utes to reduce NOx, and the maintenance interval on the AdBlue tank is 10,000 miles. The new BlueTEC SUVs meet U.S. Bin5 emissions standards and will be available in all 50 states.

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