Filed under: Car Buying , Buick , Cadillac , Ford , GM , Hyundai , Lexus , Lincoln , Porsche , Scion , Toyota Remember the days of planned obsolescence? They’re over. The latest J.D. Power Vehicle Dependability Study shows a 13-percent improvement in new car dependability over the first three years of ownership. The latest sample of 2009 model year vehicles shows the lowest rate of problems since the study’s inception in 1990. The big winner was the Lexus LS , which had the fewest reported problems in the study. Lexus was the highest rated brand as well, followed by Porsche , Cadillac , Toyota and Scion . J.D. Power says 25 of 32 automotive brands showed improved dependability, with six declining and one remaining the same. While J.D.