I was going to make a thread regarding this since I'm experiencing the same, except that I currently have Redline MT85 in the car and there are 10k miles on the fluid. As of the past 2 weeks I noticed that 3rd gear was notchier than usual and although it never grinded, it did feel noticeably different than other gears. It would not only make the "tick" noise that you describe but I could also feel it going into 3rd differently than the other gears. Not sure how to describe it.
So I'm actually doing the opposite of you and putting in the Nissan 75w-85 fluid to see if that helps. I'm hoping it will.
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