as for me i am not sure if i use ori ATF as i merely send to a BMW specialist not auto bavaria. so far have been using the car for 6 years n change once n no issue at all. initially when i took over there were signs of gear slipping but after i change theATF oil then i have no problem at all. guess it helps to change the oil periodically. anyway my wife drives the car most of the time n hardly reach 10k a year. i dont like to drive it as i find it too compact for my size lol