After suffering a bout of unpopularity in North America, diesel power is finally returning to favour. Automakers are developing extra clean diesel engines capable of overcoming extremely tough emissions controls, which are also smooth, powerful, rich in torque and easy on the wallet. Thanks to technology developed and refined in Europe, North Americans will be treated to the latest generation of engines that feature piezoelectric injectors and variable geometry turbochargers. These engines have already started to appear on ML-, R- and GL-Class Mercedes-Benzes and Jeep’s Grand Cherokee, and will appear next year in the new Volkswagen Jetta TDI and Tiguan TDI. Other automakers have pledged to enter the battle by the end of the decade, including BMW, Honda, Hyundai and Subaru
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