Released in 2004, the WL brought with it an all-new 3.6 litre Alloytec V6 engine, succeeding the old Ecotec unit. Power and torque figures were rated at 190 kilowatts (255 hp) and 340 newton metres (251 ft·lbf), respectively, while the Statesman's optional V8 was the 245 kilowatt (329 hp) version from the WK Caprice, with the WL Caprice's engine obtaining a further 5 kilowatts (7 hp). The V8 retains the four-speed GM 4L60-E automatic transmission, while the Alloytec V6 versions receive a new five-speed GM 5L40-E automatic. Several new safety features were added to the WL lineup. Such include brake assist, electronic brakeforce distribution, Electronic Stability Program and LED tail lamps. The new LED lamps give an additional five metres of warning to following motorists travelling at 110 km/h (68 mph) because they illuminate in 60 nanoseconds, compared to 1000 for conventional incandescent light bulbs.

In 2005, General Motors began exporting the Statesman to China, where it was badged as the Buick Royaum. The Royaum was initially equipped with the 3.6 litre Alloytec engine fitted to the Statesman, however a 155 kilowatt (208 hp) 2.8 litre version of the same followed later in the year. South Korean exports also began in 2005, with the same engines. They were sold through the GM Daewoo network and marketed as the Daewoo Statesman.

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Check out the Buick Royaum wallpapers and Buick Royaum Pictures (pics) collection below: