I put 3 quarts of new amsoil atf in my honda element yesterday and a half quart of the old amsoil atf that I had left over and you could clearly tell that the new amsoil was much thicker than the old. I also think that the new seems to shif a little slower and smoother in the element instead of quick and slightly abruptly like the old. I dont know if that is because of viscosity change or??? So far on my element I have done one change of Z1, one change of old amsoil atf, and one change of amsoil new atf. Maybe it shifts different because I now have a higher consentration of amsoil in there, although different formulations of amsoil. Would it be bennificial to do anouther change of new amsoil? I was driving today thinking how great my E was shifting and then I thought of the mutant mix of atf's that I have in there! Is that a problem?