The Buick LaCrosse received the lowest number of problems per 100 vehicles among midsize cars in the proprietary J.D. Power and Associates 2009 Vehicle Dependability Study SM . Study based on 46,313 consumer responses measuring problems consumers experienced in the past 12 months with three-year old vehicles (2006 model-year cars and trucks). Proprietary study results are based on experiences and perceptions of consumers surveyed October - December 2008. Your experiences may vary. Visit jdpower.com