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Since you recently bought this car, did the seller inform you that the car had a problem? If they didn't and knew there was a problem (and 1-2 quarts a week oil consumption is something they would know) that is fraud.
Did you have oil residue on your plugs when you pulled them out and checked them? Which cylinders did you have the oil residue if any?
If you are burning 1-2 quarts of oil a week your tail pipe should be black if not oily. Is your car smoking badly? Have you considered doing a compression check to find out the health of your engine? I would if I was in your position.
Although you seem to be the handy type of guy, rebuilding an engine is not for the light hearted without a thorough mechanical background. Depending on your knowledge base and tool inventory and rebuilt engine might be the way to go.
Oil consumed between oil changes (assuming 2,500 miles) should be between 0 and 1 quart, for a healthy engine.
More oil consumption is annoying, but not viewed as an issue by manufacturers, in fact most would not do anything until you exceeded a quart in 600 miles (I would be livid!!!), but that is how they think of it.
All that being so, the cost of repair far outweighs the cost of the oil, so to rebuild for oil consumption is often not cost effective. Personally, I would go mental at more that a quart between oil changes.
I see you have a four cylinder since it only holds 4.5 quarts.
2006 manual confirms your oil consumption is within allowances. Just check oil every time you buy gas like the manual reccomends. Do not over rev engine or accelerate from stops at max capacity of car as these can increase oil consumption.
A quart every 1000 miles is not unusual, but can get expensive if you are using synthetic oil. Have you always used that in this Jeep? Even though synthetic oil is of higher lubricating quality than conventional oil, it is still thinner, or has less viscousity than normal oil too. What this often means is that an older engine with slightly worn valve seals or some engine wear might consume more oil when you use synthetic. This is not a problem, really, as long as you keep tabs on your oil level.
If you want to experiment around, once it gets warmer out, you could try some 20w-50 oil and see if your oil consumption drops, or even try adding some Lucas Oil stabilizer to your next oil change. If this helps you know that part of your consumption is due to the thinner oil you were using.
A quart /1000 miles is on the high side for that mileage- something abnormal is causing it.
1) Ensure any motor oil leaks are fixed to ensure they are not contributing to the oil loss.
2) Observe if any blue smoke from exhaust on downhill coast/deceleration - if present it indicates worn valve stem oil seals (these can be replaced relatively cheaply).
3) If blue smoke from exhaust on acceleration the piston rings may be worn- (costly repair).
That's within acceptable limits according to Hyundai Motor America's standard: For a proper diagnosis, the amount of oil consumed over a known mileage should be checked three times and then averaged.The accumulated mileage divided by the total amount of oil added will give the consumption rate in miles per quart. If the oil consumption rate is greater than 1 quart per each 1000 miles, further diagnosis may be required.
Are you sure you are leaking oil? Rotary's are designed to consume oil. How much oil depends on how you drive. Oil is injected into the engine to lubricate the seals. It is normal for a rotary to consume oil. Make sure it stays full, I usually check every 1200-1500 miles or so. The Renesis engine in the RX-8 uses less oil than the previous Atkins 13b's found in RX7's. I believe I have used about a quart of oil in 8000 miles or so and that is with aggressive driving habits. The best way to maintain a rotary's oil consumption is to check in between oil changes and fill as needed. Get yourself a factory service manual for detailed info on your RX-8. I got mine from www.promanuals.net for about $20. The best tool I've bought so far my Rotary.
I do not believe there is a fix by Chrysler. My van has 50000 and seems oil consumption is getting worse. It is either past the valve seals or the piston oil control ring. I believe Chrysler KNOWS ALL ABOUT THIS! If you google search this there are to many complaints! 1 quart every 3 thousand miles is not exceptable unless you are driving a model T!
tire psi correct .no dragging brakes,clean air filter.proper gap on spark plugs,clean oil,check engine light off should be good to save and calm driving habits should help/ oxygen sensors/ o2 .should be changed at 100,000 km regardless as they wear out,slow crosscounts to ecm via fuel management ,dont over look o2 sensors just because there is no dtc in computer history