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Need some help on this one, hopefully you guys have the answer to this. Over the past week I've had this problem 3 times where I've started my truck and the oil pressure is at 0. I've noticed at pattern in the three times its done this, they have all been on hot starts. When I cold start in the morning or after work everything is fine. But if I'm driving, stop for a minute, and get back in the pressure is at zero. All three times I have shut the truck off and restarted it a couple of times and the pressure will very slowly build back up to around 25-30 lbs which is lower than normal. I've ruled out the stepper motor because I've replaced that before and have noticed differences (goes back to 0 when I shut it off, truck is chiming at me). I'm hoping this is just the sending unit, what do you guys think?

Hey guys new here. Got my 2005 6.0 SS about 2 months ago. Its been running great, yesterday ran to the corner store, when I pulled on to main road started hear loud lifter noise and low oil pressure came up on display gauge said about 10 lbs, oil changed 1,000 miles ago oil level is good. Anyone else have anything like this happen.