That pressure is normal for a tired engine... My gf's 88 has 5-7 psi at idle and 25 or so at highway..
they are low pressure high volum systems...and they are not the best systems... they have a oil cooler that will blead off oil back to the oil pan when it gets to hot.. and that in itself lowers the pressure and amunt of oil that gets to the engine parts...
Oil leaks
front seals.. id bet
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