LOL dont over think it. Pass on the DW-1 and get Maxlife. You wont look back. It 100% compatible , and works great in these transmissions. The best is , it alters your shift quality a bit towards the positive side. Try it out , if you dont like it , the next drain and fill , use DW-1. Your trans wont explode if you put Maxlife in there, it might thank you though. Both cars in my sig are spec'd for Z1/DW-1 and I use Maxlife to great affect in both of them.