Concept of the Ciel used a 3.6 liter twin-turbocharged V6 and it would not be all that unusual for the production 2017 Cadillac Ciel to receive such an engine. However, the one on the Elmiraj would be more likely. This is a 4.5 liter twin-turbocharged V8 petrol engine which has been rumored to make 500 horsepower and 500 lb-ft of torque. There are some that suggest that GM will be in fact offering either a 4.2 or a 4.8 liter unit of the same V8. This would be easier to make than the 4.5-liter unit and it should allow for similar power levels as well.