From Buick press:
The 2011 Buick Lucerne is offered in CX, CXL, EXL and Super models. All include a comprehensive list of standard equipment, with CX models offering six-way power passenger seat; heated power outside rearview mirrors; an extended-range key fob and 17-inch aluminum wheels. CX models are available with cloth seating in five-passenger configurations. Six-passenger seating is available.
Powering Lucerne CX, CXL and EXL models is a responsive, FlexFuel-capable 3.9L V-6 engine. It delivers an SAE-certified 227 horsepower (169 kW) and 237 lb.-ft. of torque (321 Nm). Lucerne Super is powered by a 4.6L Northstar V-8 engine that is rated at 292 horsepower (218 kW)* and 288 lb.-ft. of torque (390 Nm)*.
The 4.6L V-8 is paired with GM’s electronically controlled Hydra-Matic 4T80 four-speed automatic transaxle, while the 3.9L V-6 is mated to the 4T65 four-speed automatic transaxle. All Lucerne engines feature electronic throttle control to seamlessly match driver input with engine response while maximizing overall fuel efficiency.