Hi:
It could be the pump, a plugged pick-up tube or a simple oil sending unit. I recommend getting an oil pressure gauge, removing the sending unit and checking to see how much oil pressure you actually have at an idle. Once you do that you will know where the problem might be. Or, you could just change the sending unit to see if that was the problem. Chances are that is where the problem is. The 5.9L is a good engine and should long outlast the mileage you have on it now.
Let me know what you find.
Joe
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Tuesday, February 10th, 2009 AT 5:25 PM