I used penrite for the first 6 months of owning the car. It was ok but did give me some weird pressure readings. Switched to RP on the qld boys recommendation and have been very happy with it. My only problem is getting my hands on a bottle hence why I have to order it in from the parts shop across the road from work.
Sweet as. Nice work Luke. I am waiting for my bottle of oil to show up so I can change the oil in my gtr. Probably not needed as have only done 350-400km since last change, but was 6 months ago