No oil pressure at idle
Beings it's just at idle, I'm tending to believe it's either the wrong weight of oil, or a bad oil pressure sending unit.
Here's how to do a quick check.
With engine idling, remove oil tank cap, shine a flashlight down the hole, and see it you can see the oil swirling like oil is being pumped back into the oil tank.
If oil IS returning to the oil tank at idle, then you have oil pressure.
Try a new sending unit.
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