I used 10w30 in my manual whne i decided to change the fluid. The car started shifting alot harder than usual, So I flushed out the 10w 30 and put in honda MTF. the honda stuff isnt the same, ITs alot thinnner, and doesnt smell like motor oil. In anycase my car is shifting again like it was before!! (even the owners manual states using 10w30, but Honda MTF is different/better)