The Buick LaCrosse is a Buick automobile model introduced in the United States for the 2005 model year. It is a mid-size sedan and replaces the previous Buick Century and Buick Regal models. It uses an updated version of the GM W platform, featuring a V6 engine and front wheel drive. The LaCrosse features a GM 4T65-E transmission and a 3.8 L 3800 V6 as well as a 3.6 L HFV6 V6. (edit this text)