General Motors recently dropped a preview of new generation 2009 Buick LaCrosse before the official debut at Detroit Motor Show. Following that, official videos are now available for you to have a better look at the car. 2009 LaCrosse actually received a warm welcome from the press. At launch, it will come with two V6 engines developing 255 and 285 horsepower. Click here to read more about the car. Also follow the jump for the second video…