It's a 1997 XJ, 4.0L with about 121k miles. Manual transmission, if that matters. It never overheats... temp is always perfect. New thermostat and water pump less than 2 years ago. I have changed the oil recently (less than 2k miles ago). I always use 10w30. I used a Bosch Premium filter, 'cause I hear they're made by Purolator now (used to use FRAM, 'til I realized how lousy they are). I replaced the oil filter adapter O-rings at the time, and also put on a nice new Felpro valve cover gasket. I'd been losing about 1 qt. of oil every 500 or so miles. After that I went about 1000 miles before I found myself running 1 qt. low. I've never seen any oil drip on the ground, even when I park it for a while. I don't think I'm burning much, either. I've got the usual blow by crud on top of the valve cover, but I don't see how that would account for losing over a quart. Right after oil change, the oil pressure was 40 psi at throttle, and 30-35 at idle. Now it's generally 20-30 at throttle and 10 at idle.