You build maximum oil pressure by about 3 grand. No need to rev it high. Sounds like a thermostat, either stuck open or it's got an aftermarket thermostat that opens at like 73deg. I fitted one of these to mine, and under normal cruising condition's late on a cold night water temps get as low as 65deg and it goes from three bars to two. The cold start has kicked in once. Seeing you live in canberra, there's a good chance that's it. Mine didn't make it to vtec though, it cut out as per normal when it's cold.
Do you have a CAI?
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