So, my 2004 Mustang GT shifts fine, a little rough sometimes, but after braking, the trans takes a couple of seconds to re engage. The level looks fine, but I'm going to do a fluid and filter change just to start with, (cause who knows when the previous owner changed it) I'm wondering what brand you guys reccomend? I know it takes Mercon V, I'd like to use Amsoil, but it's going to run me 200+ and I'm not sure it's worth it. What do you guys reccomend?