Miata Mailing List: May 1993, Message #72
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   From: (none)
Subject: Oil Pressure
   Date: (none)

       Having heard the "ominous theme music", One should ask the dealer
       what kind of oil he put in.  It is reassuring to hear that 28 psi
       warm idle oil pressure is normal since this is about what I have.
       This seems high compared to some European cars I've owned.  The
       oil used does make a difference.  I once tried 15W50 Mobil 1 in
       my 1990 Miata, and was shocked to see the oil pressure gauge stay
       in the upper half of the scale almost all the time.  I have since
       switched to 5W30 Mobil 1, which has resulted in more normal
       pressures, but still see nearly 90 psi sometimes when the engine
       is cold.

                              Milton Horst
                              Seattle, WA