I changed the CVT oil in my brothers Scion Iq today with him, the first CVT I've serviced. He brought me Castrol Transmax ATF/CVT universal fluid. On the back of the jugs, I noticed all of the specs it covers including being compatible for use where Dex VI, Dex III, Mercon SP, LV V and Mercon and a bunch of other non CVT related ATF. I always thought the CVT oil was its own proprietary type of blend, but what is it really and what is really in the bottle? it did make a noticeable difference in the "shift" feel, it's definitely smoother and faster reacting and no whine when it's hot like it had with the old fluid.