I would say you have low oil pressure. Change the oil and filter. Use 5w20 oil or 5w30 whichever your owner's manual lists, and install a quality filter such as Motorcraft, Purolator, or Wix. Do not use any other weight oil. If the oil pressure is still low stop driving the vehicle and seek professional help.
Any Auto Parts store can provide this info.
That info should be on the drivers door jamb.
the driver info button is on the dash tothe right of the steering wheel
look in the drivers side where the door closes, it has a sticker with all the info you need.
RDS Info was created in 2005.
Usually about 30-35 oz. Don't worry about the volume as much as the pressure on the low side. I like to get the pressure in the 47 range.
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monitor and read oil pressure. sending that info to the gage cluster.
On either sides of the pump, need more info.
Which pressure. - More info gets a better answer.