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.
Most people probably don't know the name PACCAR but they've surely seen Peterbilt, Kenworth and DAF. Those are three of the biggest medium and heavy duty truck brands on the market . The smoky exhaust from those big diesel trucks has surely annoyed most drivers and pedestrians at some point in time. PACCAR produces trucks under those brands and others that are used around the world. The company has announced plans to meet 2010 diesel emissions requirements by adding exhaust gas recirculation (EG
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