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I also just took a look at the service manual, which clearly says only use GL-3 in the manual trans and GL-5 in the rear dif.
They clearly put the wrong gear oil in my MT if it's not a typo. What used to be a grind in 4th now just has pretty rough/notchy shifting all over, especially going into 3rd (although no grind).
I'm beyond fed up with this process and them screwing me/my car. I'm going to take it back and have them put the correct gear oil in, my bet is if they fill these stock with GL-4 or GL-5 that's one of the problems.
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