Lexus ranks highest in long-term dependability for the sixth consecutive year, with less than one-half the number of vehicle problems than the average manufacturer -- according to the J.D. Power and Associates 2000 Vehicle Dependability Study(SM). Following Lexus in the ranking is sports car manufacturer Porsche, with Infiniti, Toyota and Acura, respectively, rounding out the top five. Only three non-luxury makes are in the top ten -- Toyota, Honda and Buick.