For the first time in more than a decade, Buick is equipping one of its cars with a V8 engine. Available on the 2006 Lucerne CXL and standard on the CXS is a 4.6-liter, 32-valve V8 with dual overhead cams. An authoritative 275 horsepower peaks at 6,000 rpm 295 lb.-ft. of torque spins at 4,400 rpm.