lower oil pressures with age

Bernie Benz b.benz at charter.net
Tue Sep 6 10:49:42 EDT 2005

This thread must be good for something, a fill in for post holiday slack, or
a useless sensitivity training exercise!

Inasmuch as engine oil's primary purpose is cooling, low oil pressure means
that the full pump flow volume is flowing thru the bearings and to cylinder
walls rather than a portion being dumped across the relief valve.  Low oil
pressure is good.  No oil pressure is bad!  Idiot lights are good, gauges
can be bad!


> From: Brett Dikeman <brett at cloud9.net>
> Date: Mon, 5 Sep 2005 23:41:48 -0400
> To: 200q20V list mailing <200q20v at audifans.com>
> Subject: lower oil pressures with age
> Anyone else ever noticed oil pressures drop with age?
> I was rather surprised this summer when oil pressures seemed VERY low
> when warm; lower than I remember.  Sometimes below 2 bar at idle, and
> it won't climb up to 4-5 bar until about 2,000 RPMs.  Hasn't improved
> with a new filter and oil.  Used to be that it'd be dead on 2 bar at
> idle when fully warmed up, and the slightest blip of the throttle
> would send the oil pressure up to 5 bar; 1500 rpm was certainly
> sufficient.
> I had been told this is generally a warning sign of worn main
> bearings- extra slop allows more oil to flow there.  However, the
> suddenness/change with oil change leaves me wondering if it isn't a
> change in Mobil 1 oil.
> Anyone?  I've got about 201k on the clock.
> Brett
> -- 
> "They that give up essential liberty to obtain temporary
> safety deserve neither liberty nor safety." - Ben Franklin
> http://www.users.cloud9.net/~brett/
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