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Not only is topping off your clean diesel's fancy selective catalytic reduction (SCR) system with urea a bit expensive, but if you don't keep it topped off, your car may not start at all.

Audi A4 TDI - click above for high-res image gallery

Audi A4 TDI - click above for a high-res image gallery

Click for a high res gallery of the new ML320 Bluetec

Just as a whole batch of new fifty state-legal diesel vehicles are about to hit the market in the U.S., chemical company BASF is set to take advantage of the situation. BASF has announced that they will be raising the price of AdBlue by €45 per 1,000 liters. AdBlue is the 1/3 urea, 2/3 water solution used for the NOx after-treatment system in new diesel engines. The urea solution is injected into the exhaust gas stream where the heat of the exhaust causes it turn into ammonia by a hydrolysi

BMW is coming stag to the U.S. diesel party, despite hinting in October that they were close to joining fellow German automakers VW, Audi and DaimlerChrysler in marketing Bluetec technology in the U.S.

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