They stock Royal Purple oils in the performance section of Autobarn, not where the oils are kept usually. I've been using it in my RB25DET for a while now, no issues at all find it to be quite a good oil.
Autobarn sells them for normally $100 for 5L thats in Brisbane at least anyways, but I've found a local guy who stocks them for $75 so not too bad. I reccomend Royal Purple
StreetFame33