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  1. So, I have a few questions regarding the occasional low oil pressure on the 5.3L. I understand that the oil pressure screen can be the issue, I also know that the pickup tube O-ring can be the problem. Here is my situation: Last fall I was at the end of an oil change (was over by maybe 100 miles) and we went for one last camp trip. It was a 1.5-hour journey. Towing the trailer PSI was maybe 35, when I would reach towns, and stop at lights the psi would drop to 19-20 PSI. Then we got stuck in stop and go traffic and the PSI would drop to almost 0 and the warning came on. I pulled over, shut down, checked oil, all good. waiting maybe 10 minutes, fired up the truck and PSI was 40. This scenario happened 2 more times (about 30 minutes apart each) until we reached our destination. The following morning, I drove it into town and had an oil change. Our trip home was ok – no issues. Talked to my mechanic and he said probably no issue – maybe I had some debris or sludge plugging the screen on the oil pressure sensor. I had no issues all winter. I just changed my oil using Mobil 1 full synthetic and a Mobil 1 filter. Cold Start I get 45 psi, at operating temp under load I get 40 – at idle (at a light) 25 psi. I am gun shy about pulling the trailer next month. Am I overly concerned? Questions for answering: 1. If the O-ring is bad – wouldn’t I have issues ALL the time? 2. Should I insist on having the pressure sensor replaced along with the screen? 3. Can the oil pressure sensor give a false warning? My buddies came on when he pulled his trailer and he drove it that way for another 1.5 hours at highway speeds and has had no issues with engine performance. I bought a new pressure gauge and oil temp gauge and pods from Glow-Shift, and I am going to install them as a secondary way to measure oil pressure and temp. I am doing it this weekend. Sorry to bring up a topic beat to death – but I just don’t get why this happens only “sometimes” and why shutting the truck off, waiting, and restarting seems to fix the issue for 30 minutes (in my experience) Truck has oil changes at the shop as recommended. All maintenance has been consistent and up to date. Appreciate any insight and wisdom anyone can offer.
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