ALERT! DO NOT USE Z MAX TRANSMISSION ADDITIVE IN YOUR NSX AUTOMATIC TRANSMISSION. IT KILLED MINE. My 91 NSX has given 96,000 miles of trouble free service. I recently decided to put the additive Z MAX in the trans. Well two weeks latter and 175 miles and my trans. is dead. I draned the new honda ATF we put in 175 miles before and it was a black sludge. The strange thing is that the trans. works intermittently. Starting the car cold, the trans will engage all gears and run perfectly for about a mile then fades to nothing no engagement period! If you stop the car and turn it off and let it sit for a few minutes upon restart it takes off fine then in about a mile it does the same thing. No one can diagnosis this HELP! However, we will see how true the Z MAX warranty is.