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The Buick Lucerne is a full-size car sold by the Buick division of General Motors that replaced the Park Avenue, LeSabre and the Oldsmobile Aurora in 2006. Although the rear-wheel drive GM Zeta platform was considered, the production Lucerne introduced at the Chicago Auto Show on February 9, 2005 rides on the revised H-body platform of the late Pontiac Bonneville. Initial sales of the Lucerne have been strong, with the car claiming 24% of the full-size sedan market in the United States.

For 2009 the Lucerne gets some small upgrades, including a new engine, and Bluetooth phone connectivity, and XM NavTraffic. Buick has also announced that it will be available as a flex-fuel vehicle at no additional cost. Introduced at the 2007 New York Auto Show, the Lucerne Super is a more powerful, upscale trim of the original Lucerne. With an enhanced 4.6 Liter Northstar V-8 engine, the Lucerne Super adds 17 hp (13 kW) to the CXS model's V8. Updated styling to the front end and the addition of a spoiler to the rear aims to create a bolder and sportier look. Production of the Lucerne Super is scheduled to begin in 2008.