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So just to add Kwik, given the fact that the engine oil requirements at idle are vastly different to the oil requirements at high revs and yet your engine is still (hopefully) going strong would indicate a duff sender/gauge
I hope so. I'll find out when I fit the new sender, if not hopefully I've caught the problem early.
But, I still think I'd like to keep my eye on the prv, or mod it if anyone knows what to do?
I would say it's a faulty sender unit in your case Kwik.
On a standard 10mm oil pump, the PRV will open at 85psi (5.8 Bar).
Photo below is a modified straight bodied PRV ( Cosworth and RCM ) and the standard one below it.
