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40 psi or 60 are not considered low. Was there a temp. difference at the time of the test? Could the lower psi engine been run more recently relative the other before the test? Engine temperature makes a big difference in oil psi the colder an engine the higher the pressure. Also why didn't they test both at the same RPM (one at 2000 and the other at2100)? I would talk to the surveyor and get their take on the difference.
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