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My car is doing this as well. I will start the car, engine is on fast idle the oil pressure climbs to 70 psi. Then the fast idle drops to slow idle and the oil pressure will stay at 70 psi for about 2 minutes whether I'm accelerating or not. I had changed my oil at 890 miles to Mobil One 5W-30. I replaced the oil filter with a Napa Gold filter at that time. I am also concerned and will watch this thread for updates. The oil pressure will drop back down to normal (30 at idle, 45 psi under load) after a few minutes.
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