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I've been using Redline 75W-90NS in my transmission and Redline 75W-90 in my rear differential from 3,000-41,000 miles and haven't had any issues. I think I might switch to the Andrewtech Cocktail when I change the fluids again at 60,000 miles because I've heard nothing but good things about it too and I'm curious to see what all the fuss is about.
02WRXbugeye: As far as whether or not it will solve your griding issues, I don't know. The guys at Andrewtech Automotive might know though, or you could just try it and see for yourself. Good luck!
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John
2007 WRX Limited Sedan
Cobb AP Stage 2
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