The news comes as a relief to Americans who will finally get to drive low-cost diesel engines, fighting back against Europe where diesel cars rule the roost. Diesel cars are one of the most fuel-efficient internal combustion engines produced today. And this seems to be the prime reason for BMW to introduce two more diesel models in the U.S. by 2013. According to an official announcement by the world-class automaker, the new diesel models will have four cylinder oil burner and 3.0 liter inline six diesel engines.