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I put in a "new" pressure gauge and the problem is the same. What I have observed today is that the problem happens when the car is going uphill so I suspect oil may low. It was low by a quart but it should be fine. I top it up and the problem is still there. Also I remove the oil lid when the pressure is low and I don't see oil dancing around as much so the problem may be real. The line to the oil cooler is quite large, a blockage on the line is unlikely. Could it be a blockage inside the cooler? I am going to remove the sump side door and take a peek at the oil pump to see anything unusual in there. It is a royal pain to remove the oil pump to inspect it.
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