The GM 4.5L V8 Duramax diesel was designed to fit into SUVs and light-duty pickups. However, GM engineers have been saying that the four-valve diesel V8 would also fit in the space of a small-block gasoline V8.
According to some inside sources, GM is considering throwing the 4.5L Duramax V8 turbodiesel into the bay of the Cadillac CTS, which is pretty straightforward for engineers as long as they use the raised hood from the CTS-V. Then engine is capable of producing more than 310-hp and a peak torque of 520 lb-ft. Yes, it’s legal in all 50 states and meets the 2010 emission standards.
With the Ultra V8 gasoline engine dead and the CTS due to get a 2.9L V6 diesel engine in Europe, the 4.5L V8 Duramax diesel seems to be a perfect fit for the CTS lineup. Motor Trend points out that while a diesel CTS for the U.S. would be a risky move, the downside for GM is minimal since the engine already exists and it’ll only help it get closer to CAFE regulations of 35 mpg by 2020.
Obviously, the 2.9L V6 diesel would also help.
2009 Cadillac CTS-V:
Source: Motor Trend