Miata Mailing List: April 1995, Message #21
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   From: gt0648b@prism.gatech.edu
Subject: Weird oil pressure stuff.
   Date: Sun, 2 Apr 1995 00:40:38 -0500

I recently got my oil changed to my usual Syntec, but the pressure guage
is doing funny things.  When the car is first started, it is maxed out,
~90psi,  then it returns to normal (~30 @ idle, ~60 @ cruise) within about
five minutes, corresponding with the general warming of the car (doesn't
happen whenb started warm).  There don't seem to be any odd performance
quirks, but anything funky about the pressure guage concerns me.  The
weight, byt the way, is 5W50, so viscosity shouldn't be the cause.
:-???
Josh