Dear All,
I have similar problem like Pilot 2000
My 91-300E ( 156Km) measures 3 bar at starting up with idel at 1500rpm

As soon as it warms up to 80deg C. The oil pressure fluctuates with the rpm. It drops to zero when it idles ( 700 rpm). It jumps quickly to 3 bars on acceleration above 1200 rpm.

The Zero Oil pressure is measured with a mechanical gauge outside the engine block.

The car had been like that for the last two years.

two days ago, my mechanics installed a new oil pump and a new timing belt tensioner. but the problem is the same

The oil is changed regularly ( 3km) at the dealership
My mechanics gave up and is recommending buying a used engine or open the engine to check.

Any helpful ideas Please