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It's worth noting... GL-5 absolutely does not belong in your transmission (unless also GL-4 rated, e.g. Motul). Maybe that was a typo?
Most GL-5 oils shift like dogshit. This is a persistent problem for AWD Scoobies because the gearbox contains the front differential and hypoid gears and it absolutely needs GL-5.
Now I'm not pretending to re-engineer Toyobaru's product here, but imo the factory tranny fill is poor. It just doesn't shift well and it's horrid when cold. Synchronizer performance *will* be improved by substituting something like Redline MTL GL-4, but note that MTL is a bit lighter than the book spec. Guys that have tried MT-90 (similar, but heavier, meets book spec) report that it shifts poorly when cold. My car (so far) shifts great on MTL, best when at operating temperature.
Trans oil selection can be everything and you'd think the engineers at Toyobaru and their trans vendor (Aisin) would know this, so wtf is up with this?
Anecdote: I had an early wrx that at 80K miles had to be double clutched to get into 5th. Before too much longer it was 4th and 5th. The car would have been completely unsalable at this point and I was beginning to face up to a transmission repair. A little fiddling with oil selection (might as well try!) *completely* solved that issue (nothing was actually broken) and the car has done an additional 100K since with no problems!
The manufacturer's poor attempt at CYA is really annoying here....
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