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I just had my oil pan off to replace leaky gaskets. When running my engine at idle now I see my oil pressure fluctuating from 0 to 10 lbs. Is this normal? I did not notice this phenomenon before.
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To answer your question specifically, there is not a true pressure in a stock Model-A oiling system since the system does not have a cap to build pressure. The pump is really just a lift pump used to transfer the oil from inside the oil pan up into the valve chamber area where it will feed different areas thru gravity before falling back to the oil pan sump. My advice to you is as long as the gauge is moving, it likely is showing you that oil is being transferred. If that is the case, you are fine.