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The old pumps that comes with our mustangs have some fragil internal parts. But, it does not loose pressure slowly. When it breaks, it's broke. I would suggest you replace the sensor, and flush your engine a few times. Also you ARE using 5w-20 right?..........
I'm using the motorcraft oil filter, they do a better job than the rest of them out there. I will be converting to a By-Pass oil system soon thou. That might be a option for you.
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