I have a 2006 c2 that has fresh oil change with filter, Mobil 1 0/40# and I get 5 bar oil pressure after warm up still get 5 bar at 4000 rpm and at idle get 2+bar. I I think it is supposed to be 3.5 bar at 3000 rpm. Where should I look to correct the problem? gauge or sensor or both?

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3.5 bar at 3000 RPM seems low to me. I am not aware of a spec for oil pressure at 3000 RPM. If it was low I'd recommend checking the oil pressure relief valve but your values seem to be about normal.

- Casey

The only certain way to confirm oil pressure is with a good mechanical gauge . Your pressure seems normal to me but if it is way off the first suspect is usually the sending unit