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The engine is a 100k miles RB25DET on which I change the oil and filter every 3k miles, I use Silkolene Pro-S 5w40, the engine generates around 320bhp atf.

I have an aftermarket oil pressure gauge, sensor is attached to a sandwich plate on the block. Recently I noticed a weird noise when I cold start the car and the oil pressure fluctuates between 4bar and 7bar on idle. Before it used to sit at 7bar on idle until it got a bit warmer. The noise is definitely related to the oil pressure fluctuation.

It goes back to normal behaviour after a minute and sits at 6bar on idle.
Oil and filter have been changed less than 1000 miles ago.
Any ideas of what it could be?
 
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