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At what RPM ? Type and quality of oil, RPM, temperature all have an effect on oil pressure. If it's a motor with high milage then the bearing clearances will also show a reduced pressure.
my 2001 reads at 28 psi occassionally if the car has been on the road a while ( engine warm) and im going at a low rpm. most of the time mine is in the mid 40's though, with only low to moderate rpm's.