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This is correct. Maybe there has been some confusion- I'm familiar with what the manufacturer recommends. I was just looking for people to share first hand experiences with this transmission and their preferred fluid type. However, It's starting to look like performance of different fluid types...

It's a 2021, final year.

I did contact them, but their answers were pretty "cookie cutter". They wouldn't give any real world answers, just a TDS and told me to verify compatibility with owners manual. Seemed to avoid my direct questions, and they stopped replying to me after the second email.

Good to hear Motul working well for you! My car calls for 75w90.

GL4? The manual calls for GL5, although the Motul is “GL4/GL5”

I believe this is true for standard WRX but not for the WRX STI variant- which is completely different mechanically.

Starting from the beginning... Just hit 30k in my Subaru STI and I decided to change the trans/r.diff fluid. I understand it wasn't absolutely necessary, I just wanted to do it for the sake of maintenance documentation. Anyway.. I drained the precious, unobtainable factory fill (discontinued as...