Miata Mailing List: May 1994, Message #154
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   From: jim.chu@worldnet.com (Jim Chu)
Subject: Oil Filters
   Date: Sat, 7 May 1994 02:03:33 -0400

TM> What bothers me is that the oil pressure is now running
significantly higher during warm-up and I believe just slightly higher
during warm  operation.  Has anyone changed to Bosch filters and
noticed this pressure increase?  I am tempted to go get another Fram and
put it on to verify that it is the filter characteristic.

Tom,

The high oil pressure is from using 5w30 oil.  I've noticed the same
thing when I used it in the winter time.  I tried Castrol Syntec, but
didn't mentally like the 5w50.  I felt the range is just too great.  The
oil pressure gauge with 10w30 will be around 60~ when started from cold
and 30~ when warmed at idle.

I use Fram oil filters on the Miata and for the last 8 years on my old
MR2.  Fram oil filters has been one of the industiry leaders in oil
filters.  They trapped more smaller particles on the first run than most
leading filters.  Yes they do have a override valve.  The number is PH
6607.  I get it from Ames on sale for 2 for $5.  Regular price is about
$3ea.  That's MUCH cheaper than the auto parts store who wants $4+ ea.

I use the Bosch oil filters on my Probe GT.  I can't seem to find the
correct Fram filter for the Probe.  The Bosch's sells for about $4ea at
Trak Auto.  Be aware of the cheap filters as they don't have the
override valve and the filter paper will let smaller particle filter
thru.

I have my doubts about the quality of the Mazda oil filters... I'm just
guessing that they contract out to a major company to produce it to OEM
specs.  I want something better than oem specs.

Jim Chu
jim.chu@worldnet.com