I can't say it was the fluid for sure, but I do know that at about 90k miles on my tranny I had no problems. Switched to the Mobil 1 coctail and 3k miles later my 3rd gear starts to grind on quick shifts, which steadily over the following month or two it got worse to the point I had to match revs before engaging 3rd without a grind. I dunno, maybe it was coincidence.
