Q: I have low oil psi changed switch and screen psi came up and went back down could it be the oil pump

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I have a 2008 Chevrolet suburban LTZ 5.3 L Engine oil pressure suddenly dropped alarm sounds with the message shut down engine I've Changed the pressure switch and screen at psi went to 40-45 on gage for about 10 min. Went back to zero (0) could it oil pump,

My car has 166000 miles.
My car has an automatic transmission.

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