a synthetic trans fluid isnt making your tans slip, i have it in mine and it has been worry free, we have 7 other cars at our house that all has synthetic trans fluid and a lot of our friends are using sythentic trans fluid without a problem, a great synthetic ATF is the AMSOIL ATF, its approved by most car manufatures and exceeds all the tests done it on. it is so far the best ATF out there along with all their other line of products