Miata Mailing List: May 1994, Message #134
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   From: bruce@lurch.Data-IO.COM
Subject: Re: Oil Changes/Pressure/Wa
   Date: Fri, 6 May 1994 11:41:43 -0400


Uh, I changed from Fram to a Mazda filter (both with 5W50 Syntec), and my
oil pressure went *UP*.  Now with the Mazda filter, it runs 70ish at cold
start/idle, near pegged at cold/3000, and 70ish at warm/3000.  It used to
sit at 60, not 70ish.  

Maybe each filter (not brand, but each sample) is a little different, and
the Miata is sensitive to the difference.

--bruce@data-io.com
Monroe, WA

>> ...I did my first oil change on Mimi (up to now I had had it done
>> by a garage).... Has anyone changed to Bosch filters and noticed [a]
>> pressure increase?  I am tempted to go get another Fram and put it on to
>> verify that it is the filter characteristic.
>> 
>> --------------------------------------
> Well, I know I'm sorta new here, and what do I know, but...
> 
> The MCA magazine recommends using only the Mazda filters.
> According to a download from Miataville about a year or so ago, 
> there was a discussion about oil pressure changes similar to
> what you have described---  A change back to the factory
> filters apparently cured the "problem".