My old jeep with the 4.0 was like that. I just kept adding oil every week or two when it got down past the safe zone, not doing any oil changes for about 60k. That thing had about 260k on it when the transmission blew up and I didn’t have the time or money to keep going with it. My 2010 is damn near the same at 180k (the pos 3.8), but that motor is due to be swapped soon due to loss of compression.