lower oil pressures with age

[Brett Dikeman]

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
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