2006 Hyundai Sonata GLS (3.3). 120,470 miles on car, and ~19,800 miles on mostly OEM ATF, with 1qt Mobil1 Synthetic (not SP-III rated, I realized later). Drain and fill 5 quarts of MaxLife Full Synthetic. Have already put over 1k miles on new fluid and the slight hesitations I was feeling are gone.