The Buick LaCrosse is a mid-size luxury sedan produced by General Motors. The Buick LaCrosse, is a four-door sedan which replaced the Oldsmobile Intrigue, Buick Century and Regal in North America beginning in the 2005 model year.
The LaCrosse made its debut in late 2004 as a 2005 model to replace the Century and Regal. Riding on a revised version of the W-body known as MS2000, the LaCrosse was initially available with two powerplant choices in three trim levels: a 3.8 L 3800 Series III V6 available in base CX and mid-level CXL forms, and a 3.6 L HFV6 V6 in the top line CXS model. Power is routed to the front wheels via a 4T65-E automatic transmission (4T65-E HD on Super's).