1. Buick received the highest numerical score among mass market brands in the proprietary J.D. Power 2014-2015 Customer Satisfaction Index (CSI) Study.SM 2015 Results based on responses from 70,483 owners and lessees of 2010 to 2014 model-year vehicles, measuring 20 mass market brands, and measures satisfaction among vehicle owners who visit a dealer for service during the first three years of ownership. Proprietary study results are based on experiences and perceptions of owners surveyed from November-December 2014. Your experiences may vary. Visit jdpower.com.