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Nice to see some local Aussie Penrite data on this thread. Back on page 6 there was a lot of discussion about HTHS and a great post from Raymond.

I got in touch with Penrite about HTHS of their oils and they came back with:

HPR 5 - 4

HPR 10 - 3.7

HPR 15 - 5.4

so it seems any of those are suitable for S38 applications from a HTHS perspective. I'm quite surprised how high the HTHS for HPR15 is I currently run HPR10 and have been for quite some time. No UOAs unfortunately, but the car seems happy.
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Konfused Pete
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