You have a source on that? I'm not an oil filtration expert, but I don't believe you can generally correlate your oil pressure (as in, gauge reading with an aftermarket PSI gauge) with the relief valve pressure in the oil filter. The relief valve's rated pressure (usually quite low, e.g. the popular KN/Mobil1 for our cars is rated 11-17 PSI) is the pressure *differential* between the input and output sides of the filter, not the absolute pressure you see on your gauge.
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