Miata Mailing List: May 1993, Message #67
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   From: (none)
Subject: Re: oil pressure and gauge settings
   Date: (none)

garvin@cfd.mae.ncsu.edu (Michael Garvin)
>	After I had the calibration checked and the pressure read off the
>pump I found this out.  It appears to be right at 18psi at the half-way point.
>The manual says that 1k warm idle pressure should be 28psi, and the deviation
>was what was worrying me.  Replacing the oil pump helped some; I now get  
better
>pressure (nothing below about 18) than I was, but it still isn't what it was
>before the dealer did a tune-up and oil change (ominous theme music).  I've
>had the good performance place check it again and they said I was getting good
>lubrication and not to worry unless it dropped under 10psi.  The owner said
>they could shim the pump/valve if I was really concerned about the pressure,
>but that he wouldn't really recommend it or do it on his own car (so I  
didn't).
>I just keep an eye on the gauge these days and don't worry about it; with the
>temps in the 80s I just enjoy the car!  Perhaps when the redesigned Miatas are
>brought out I'll replace mine...

You might just try changing the type and weight of oil you're running. I use  
RedLine synthetic 20W50 in my car and it almost pegs the guage (about 80 PSI)  
on start-up and it *never* gets below 1/2 on the gauge. 


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