File:Navistar DT engine.jpg

Image of a 2004-2008 model International DT 466 engine. Sourced from here

Rationale: There are very limited opportunities to create free images of this engine, especially fully exposed as in this image, as opposed to installed in a truck, as photos of this engine removed or not installed in a truck are rare. Also, this image provides much more clarity and detail than any photograph made of the engine in a truck or bus, where the engine would be obscured by hoses, tubes, wires, and vehicle structures, would be. Finally, a photo of the engine in a truck or bus would show significant dirt and weathering, further obscuring the technical and mechanical details.