Diesel engines, for all their rugged usefulness, can be tremendously polluting. They produce more NOx — nitrogen oxides-based emissions – than gasoline-fed cars, as well as more particulates, aka soot ...
When it comes to debating the best diesel engines ever put into pickup trucks, it doesn't take long for Ford Power Stroke models like the 7.3L and 6.7L (not to be confused with the 6.7L Cummins diesel ...