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As long as there are no unusual engine noises like ticking or knocking, the most probable cause for these symptoms is a failing Oil Pressure Sensor. These sensors are actually fairly common fail items on these vehicles. It's located on the passenger's side of the engine, above the Starter (image location view here:https://www.dropbox.com/s/h3xcquxrjgqaani/1j.jpg?dl=0 ). Inspect the electrical connector and wire harness for any loose, broken, damaged or oil soaked wires. If the visual inspection checks ok, replace the sensor.
As for the correct engine oil capacity- according to the Jeep service manual, when replacing the engine oil and filter, 6 quarts is the correct amount.
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