Miata Mailing List: November 1992, Message #34
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   From: (none)
Subject: Re: oil pressure
   Date: (none)

> The oil pressure at start up idle is about 70-75, and if i drive before 
> letting it warm up at least 10 minutes, the needle sometimes come close to
> hitting the 90 mark at about 2500-4000 RPM .  After about 20 minutes of 
> driving or so, the pressure stays between 25 & 65 or thereabouts
> 
> are these typical readings? 

Yes.

The shop manual (which I don't have here so I'm writing this from memory)
says that the oil pressure at normal operating temperature should be between
25-30 psi at idle, and between 55-60 psi at 3000 rpm.  It says nothing about
pressures when the oil is cold but my own Miata behaves like you described.
Just drive gently until everything is warm and normal.
--
Michael J. Abbott		mja@kpc.com
Kubota Pacific Computer Inc.	Santa Clara, CA		408-987-3303