Bob,
The oil pressure is great for a waterboxer!  Especially with that much
mileage.  I have an oil pressure gauge on my Van and at around 300k
miles it was reading just at 4 psi at idle and the oil light was
flickering at hot idle.  I rebuilt the motor and the readings I have now
are right around what you are seeing with your 250k mile motor.
Whatever you are doing, keep doing it!

--
Thanks,
Ken Wilford
John 3:16
www.vanagain.com
Phone: 856-327-4936
Fax: 856-327-2242

On 12/16/2012 2:51 PM, Robert Clemmer wrote:
> Ok, I've replaced the water pump and rear heater core in my young 91 2.1
> automatic tin top.  While I was there, I did some "you might as wells".
> Changed all the fuel lines and removed the plastic fire wall fitting.
> Replaced the O-ring on the breather tower.  The old one was so hard and
> brittle it came out in pieces.  And, finally installed an oil pressure
> gauge.  Next week, lube oil analysis.
>
>
>
> What I got was 70 lb. pressure at cold idle.  It is fairly cold here so the
> best I can do is 190 degree oil temperature.  At that temperature I have 18
> lb. at idle and 45 lb. above 3000 rpm.  Close to 50 lb. cruising at 4150
> rpm.
>
>
>
> What I don't know is this good, bad, or average?  I've been running Mobil 1
> 15w-50 oil and this engine just turned 250K miles.
>
>
>
> BobC
>
>
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