Yes. Andrew from Andrewtech is an acquaintance of mine. He got the recipe for the "Andrewtech cocktail" from Redline themselves. I don't remember the exact reasoning for it, but he said that Redline LW Shockproof is almost perfect for our transmissions, and that adding the Motul gear oil corrects a cold weather issue (don't remember what it was) that the Redline fluid alone would have.
One more question and then I'll shut up about it. Thoughts on Amsoil? My pal at the Corvette forum is a dealer for them and says that their primary recommendation for the WRX (both manual trans and both diffs) is their Severe Gear 75w90 (product SVGQT)
Thanks again for the help. Lots of great info after searching.
Just thought I'd post the results. Went with 3.5 quarts of Amsoil Severe gear oil 75W90. Smoother shifting right from the get go. I bought some Red Line for my Corvette manual trans and although it's not apples to apples I'll see if I like their product as well.