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The oil pump has a pick-up screen that is inside of the oil pan and it sounds like the screen is stoped up with trash. When you start it it takes about 30 mins are so for it to stop up. then when you turn the engine off the trash falls off of the screen and you get your oil pressure back again. This is 1 thing that could be wrong. Another thing that could be wrong is the oil pressure spring that is in the oil pump may be broken and you can replace and check that with out removeing the oil pump.

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Q: What causes oil pressure to drop on 2006 Chevy 2500 6.0 v8 other than oil pump Oil pressure fine for first 30 minutes of driving but then starts to drop Kill engine and restatrt oil pressure fine?
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