Manual trans fluid change 2010 Yaris 3dr LB

[DANIELTNIEVES]

I'm wanting to get my man trans fluid changed, but all the toyota dealers around here use GL-5. I've read all the posts about how GL-5 doesn't work as well as GL-4, and Redline MT-90 75W90 GL-4 seems to be the most preferred one by Yaris owners but they all seem to have Yaris's before the 2010 model year. I'm thinking of doing it myself and just want to make sure that the GL-4 better than GL-5, and the preference for Redline MT-90 75W90 still apply to my 2010 Yaris 3dr LB. Is this still true for my car?

[DANIELTNIEVES]

Today I learned that my 2010 Yaris has the manual transmission (transaxle) and differential combined in one housing and sharing the same fluid. So the posts that say GL-4 fluid is better for transmissions and GL-5 is better for differentials confuse me since they are combined in same housing and use same fluid. So is GL-4 still better than GL-5 for the combined transaxle and not a problem for the differentail part of it?

[Hershey]

GL-4 is better . Found out by using Mobil1 GL-5 75w-90 . Poor shifting , grinding and clunking into reverse . Replaced it with Redline MT-90 GL-4 with great results . Amsoil GL-4 should be fine as well .