What production date is on the car? You could just use regular ATF, and not the expensive kind. But if it is the special stuff, it is computer controlled and the computer will alwase adjust shift pressures to make it shift nice. But he problem is the bearings and races in the trans. Doesn't matter if you change the fluid or not, they are defective, so around 80-100K you will be puting a trans in it, and making sure the computer is up to date. I reccomend this site. We do alot of buisness with them and they are better and cheaper than factory. They put better parts in the trans, and are up to date on everything! I would not reccomend anyone else. Here is the link. www.peterschmid.com Really should replace the fluid in the converter, if you get tired of waiting for the fluid to drain, loosen the 19mm size banjo bolt on the drivers side. Just crack it and turn it once or twice.