The Buick LaCrosse originally came with 3 trim levels - the CX, CXL, and the top-end CXS. Most of the benefits that you get when upgrading from the CX to the CXL concern nice-to-haves and luxury features. For example, the CXL gets you heated leather seats - compared to cloth seats in the CX. But upgrade even further to the CXS, which offers both heated and ventilated leather seats. For certain model years, the CXL trim on the LaCrosse can be had in either front-wheel drive or all-wheel drive. The FWD variant came with an Ecotec 2.4-liter 4-cylinder, while the AWD model is paired with a 3.6-liter V6 as standard. In addition, other little tweaks and performance updates for the AWD.