Power for the 2006 Buick Lucerne CX comes from a 3.8-liter, overhead valve, 12-valve V6 generating 197 horsepower at 5,200 rpm and 227 lb.-ft. of torque at 3,800 rpm. This tried-and-true workhorse, long a faithful engine to countless GM vehicles, features a cast iron block and cast iron cylinder heads. CXL models can also be equipped with this engine.