2002 Trailblazer 4.2L oil pressure drops randomly
I did an oil change on this truck and after that, the oil pressure would randomly drop off. I have connected a mechanical guage to verify. I have changed the oil pump & pickup tube. I recall when first draining the oil, there was much more than 7 quarts. I did not think to measure the quantity, but I have changed enough oil in 25 years to recognise the time required to drain. So I thought perhaps someone knew oil was not returning to the oil pan quickly enough. So I have 10 quarts in it now.
I am at a loss and am not sure where to go from here. I am not familiar with this particular engine but have done work on many, many engines over the last 25 years. This has me baffled. Any help would be appreciated.
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