Rule of thumb is 10lb per thousand rpms.

Karl Wolz
Sent from my electronic umbilicus

On Dec 16, 2012, at 12:51 PM, Robert Clemmer <n51219@COMCAST.NET> 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