Gareth.
I'm biased but I also know the Castrol LSX is the best mineral LS oil out there , if you're worried about temps they also make a fully synthetic called SAF-XA its the gun product and used by all the V8 Supertaxi guys. You would need to check suiteability for the Torsen but it should be good, I can chase this for you if you want?
Cheers