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What causes low oil pressure when the oil level is correct? on 2002 Ford Explorer

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My 2002 Explorer has approx. 160k miles and in general is in good running condition. Very recently the "Hi Temp / Low Oil" warning light has come on. This has happened 2 times. Only when driving after the car is warm. Each time the "Hi Temp / Low Oil" ligt came on, the Oil Pressure Gauge needle also dropped. The warning light and gauge fluctuation were only momentary, lasting only 1-2 seconds, but at that time the engine seem to stall a bit. The first time, I checked the oil level which was low, and I added oil to the proper level. The second time was very soon after an oil change had been done. I checked the oil level, but the level was correct. I have not talked to a mechanic about this yet.
(1) Answer
bad or weak oil pump! it can also be that your oil pump is clog due to junk in engine.I suggest you try a oil treatment first, if that dont work I would check oil pump.