i havent used any in my truck yet but i used some of the manual trans fluid in daily with a 5 spd and it has been great so far. smoother shifts and also my car used to shift very stiff in the winter until some heat got in the trans, now its smooth all the time. very happy so far. i use amsoil oil in my raptor and ive been happy. will be using it in the trans and diffs when the time comes