I used redline 75w90 synthetic gear oil in my r32 gtst diff. if you've got a "viscous" LSD (mine's got an orange sticker on the side that says "viscous" , though you need to take the passenger side rear wheel off to see it) you shouldnt have to worry about "friction modiffiers" as only the mechanical style diffs need em
oh yes if you're running lots more than stock power then you could use some redline "heavy shock" gear oil
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