Awd binding again

[msvx95]

I ordered some Additive online from NAPA yesterday.
I just want to know if this is the correct additive to add to the tranny.

P/N: Lubegard BK-765-2603
I couldn't get a view on the bottle to know exactly if this is what I need, but I think I read somewhere on NAISOC that impreza owners have used this.

They also mention MOPAR LSD additive and a GM Limited Slip Additive, but no part numbers and much descriptions as well on this.

Anyone know what Subaru uses and if so, what part number? I want to add this to my car when I get it back from the dealer. My suby dealer never adds anything to the transmission fluid...so I want to do this myself and diagnose from there.

Thanks,