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Lost oil pressure. Jumps to about 20 at start up and drops to 0, jumps to about 25 under load/ driving and drops back to 0 at stop. Replaced sensor with GM unit and no change. Does this vehicle have an oil sensor filter screen?
edited to add: about a year ago I dropped my oil pan, removed the oil pickup tube, replaced the o-ring, and reinstalled with a new gasket in about 3 hours. Not too bad a job, and the gasket & o-ring doesn't cost that much at the dealer.
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