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Re: Oil pressure drops as engine gets warm
Welcome Aboard!
Even if the gauge is correct, that oil pressure is just fine. The general rule for a SBC is that it requires 10 PSI for every 1,000 RPM. At an 800 RPM idle, 15 is just fine. If you are really concerned, drain the oil and replace the filter. Install any oil filter you want so long as it reads "Wix" or "Hastings" or "Delco" (more specifically, anything that doesn't read "Fram") and add the appropriate volume of 10W30 Mobil 1 or Amsoil. The viscosity index of a PAO synthetic is a lot better than that of a mineral oil with the same base viscosity range.
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