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The first step is to hook up a test gauge and see if it really does have low oil pressure. Even with the mileage you've got on your truck it's just as likely that you have an issue with the gauge or sending unit as with the motor.
 

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Remove the stock sender and put the gauge in there. With the truck at operating temperature you're looking for over 12 psi at idle, 24 psi at 1200 RPM and 45 psi at 1800.
 
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