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The oil pump typically does not "spontaneously" fail. The engine asks for 30 PSI of oil pressure at idle. The first stage of the failure is a "half failure" where you don't lose all oil pressure, but you lose a chunk of it. If your idle oil pressure ever falls to 20~ PSI, then you need to start being concerned.
If you spot check your idle oil temp when warmed up and it is 30, you have nothing to worry about currently.
Hope this helps
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