I've read all the posts regarding oil pressure drops but before I go ripping things apart I thought I would verify some of my conclusions. A couple of weeks back I noticed my oil pressure had dropped from around 40 psi at idle when warm to 30 psi. The next day I had around 20 psi at idle and around 35 psi as I accelerated from a stop up to 40 mph. The day after that I was at barely 10 psi at idle and around 20 - 25 psi driving. That night the oil pressure warning came on as I was backing into the driveway. If I revved the engine I could get it up to 20 psi and the warning would go off. Then we get nailed with two feet of snow so the truck is sitting in the driveway buried in a snow bank. I started it today thinking the cold weather, just above freezing, would bump up the pressure. Instead, it would barely come up above zero so I shut it down. Now I am even afraid to turn it around so it is facing the garage. I may be stuck working on it were it sits. My guess is the pump pick up o-ring or maybe the pump. Not too worried about bearing wear since it happened so fast. Before I do that I wanted to check the following. The gauge tipped below zero then goes up like it should when starting so I doubt it is the stepper motor. Has any body ever had this happen like this and it only be the sensor? My truck is a 2006. Is it true that the lifter filter screen under the sending unit was not used until the 2007 and up motors (and earlier non-Yukon models) with the Displacement on Demand? I had done an oil change 2 weeks earlier with a house brand cheap filter. I usually use Fram filters. I have heard of similar problems with filters collapsing. Any chance of this? Any other thoughts based on experience before I drop the pan?