I have to chime in here - I'm reconsidering options as I'm not at all impressed with Redline in my tranny or diff. I just changed it and have only put around 1000 miles on the car since. Used MT 85 for tranny and 75w90 for the diff. I'm going to go Motul and possibly sooner than later.
The car honestly feels no different after getting rid of the fluids at 30,000 miles. The diff fluid was almost completely black too.
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