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engine oil pressure low

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the words low engine oil pressure stays on at all times

Vehicle: 2000, make gmc sierra, car model 1500, size engine 4.8 L

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Low oil pressure stays on is from the oil pressure sending unit,or even low oil level, or a faulty oil filter, The specification for oil pressure is 6psi at 1000 RPM,18psi at 2000 RPM,for added precaution get the oil pressure check,

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