Overall customer satisfaction with dealer service improves considerably in 2008 – with more than two-thirds of the 37 ranked brands demonstrating gains – according to the J.D. Power and Associates 2008 Customer Service Index, or CSI, study released today. The study, now in its 28th year, measures satisfaction among vehicle owners who visit the dealer service department for maintenance or repair work during the first three years of ownership, which typically represent the majority of the vehicle warranty period.