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Might be worn main and connecting rod bearings. Purchase a manual oil pressure gauge, and install the gauge where the oil pressure light is hooked into. Pressure should be between 40- 60 psi. If not, then you need to remove the oil pan, and hook up a pressure checker to the spot where you installed the manual pressure gauge, and pressurize the bearings, and see how the oil drips off of the bearings. Should just drip, if bearing is good.

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Q: What makes oil light and pressure low after changing the oil pump on a 1998 Ford Windstar?
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