I initially used penrite sin 80 and last time refilled with the Pro gear 85w140 which is the new name for sin 80.
Found them excellent in my mazdaspeed clutchpack diff.
With the clutch in you wouldn't even know its a LSD its so quiet and chatter free, yet still locks up as soon as any load is applied.
Would highly recommend the penrite diff oils (and in fact any of their other fluids) i'm currently running their 15w50 10/10ths
6-speed - 5th gear grinding on track
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