Detroit Diesel has been in the engine-building game for over 85 years, and in that time they have established themselves as one of the most reputable diesel engine manufacturers in the country.

This 2011 Cascadia with EPA 2010 DD15 engine, above, is a customer demo unit already in revenue service. We drove it first. We liked it a lot.

It practically goes without saying — big trucks require powerful engines, and that's exactly what the Detroit DD15 engine promises to deliver. The engine was introduced back in 2007 after a nearly ...