The American car buyer is reputed to be warming to the idea of diesel power after several decades of disinterest, though few carmakers have dared to test the strength of that demand. So far the primary candidates have been luxury and sedans, but now Cadillac is rumored to be working on a fitment that's sure to entertain as well as push the economy button: a 4.5L Duramax turbodiesel V8 for the CTS.

Rated at 310hp but a monstrous 520lb-ft (704Nm) of torque, the big diesel carries the potential to fill a gap in the current U.S. CTS lineup left between the standard 3.6L direct-injection V6 model and the 6.2L supercharged V8 of the CTS-V . The project, uncovered by Motor Trend is reported to already be in the works, and is proving to be fairly easy given the work already done to fit the LSA... // Motor Authority