Mazda MX-5 Miata Forum : “What is the idle oil pressure of a '91 mazda miata?”

It can vary from car to car, but my '91 idles just under 30 PSI.  The temperature of the motor also changes it, of course.  The cooler the motor, the
higher the oil pressure.  If you run the car on the freeway for a few hours, the pressure will be slightly lower than normal.  Anything in the ballpark
should be just fine.