Poor shift quality, which was resolved by changing the fluid back to the Honda ATF. Customer was an avid DIY'er and decided to change his ATF to Amsoil ATF, according to the service writer the job was done properly. The guy took the car into Honda to have it checked out, they drained and refilled with Honda ATF problem solved. There are a few cases of this in some of the Honda forums I was told. I did not look for myself. There are also people satisfied with Amsoil ATF in Honda cars.