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Chevy 6.0 low oil pressure

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Hi I have a 2015 Chevy Express van with the 6.0  engine.It has only 20psi on the oil pressure. I have changed the oil pressure sending unit, still low. It's looking like the oil pickup tube O ring may be bad. I ovefilled the oil and parked on a steep hill to try and submerge the pickup tube. No better. What's next? Change the oil pump?  It only has 87k miles. Any suggestions?

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It could be crud blocking the oil pickup screen.  You'll have to drop the pan anyway to check the tube and the o ring seal.

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Well I changed the pump and the o-ring the o-rings are actually will go wrong and those things most of the time but you never know you take it all apart you might as well change the pump too

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