Current diesel truck engines, for example, are over 90 percent cleaner than models from years when they were unregulated. (newscenter.lbl.gov)
General Motors is introducing a new turbo - diesel Duramax engine to its Chevrolet Colorado and GMC Canyon midsize pickup trucks this fall, the cleanest diesel truck engine ever produced by the automaker. (autofocus.ca)
It is also the cleanest diesel truck engine ever produced by General Motors. (cheersandgears.com)