I poured Scotty's cocktail into my 115k mile MY91 Legacy turbo about 500 miles ago. Not a dramatic improvement. I was hoping that my sketchy 3rd. gear synchro would be smoothed out, but it still requires patience and attention. I used:
1qt. Redline Lightweight Shockproof
1qt. Pennzoil Synchromesh
~ 1.7qt. Castrol 80W90 Hypoid
I'll post again if I have further information to add.