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After engine warms up oil pressure drops to 0 at idle. on 2001 Dodge Ram 2500

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It goes back up to about 28 lbs when rpm reaches 1000 or more.
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I had a 1995 DODGE RAM 1500 with a 318 c.i.d. engine that did something similar,If oil level is ok. , and there is no knocking or tapping, Try another oil press. switch .There not that expensive but they are a bit of a pain to get to......back around the distributor.If memory serves me right i think you may need a special socket to remove the switch. Good luck