2010 jeep liberty uses 1 quart of oil every 1000 miles

Maybe slowly being burnt via leaky valve lifter seals. About a quart every 800 miles? I have same situation - Just add oil - expensive to repair.

key factor here, is source

my guess, is the car was never serviced?

and the PCV valve clogged long ago and now you have illegal

engine bypass gases venting at hoses cracked or lots of places

and the PCV gases do stink, that will wift in the the cab.

that is my wild guess. but do get a mech to find it.

we can smell anything here, nor try to find source.



and do replace the PCV if clogged. or at 60,000 miles.



high oil usage , do tell, quarts per 3000 miles.

and high speed will suck more oil as will running thin oil.

change the pcv valve this maybe the cause of it burning oil.causing too much pressure in the crankcase system

One quart per month is a bit more than I'd expect but you didn't mention how many miles you drive during that month.If you live where the ambient temps are very warm, it may help to use a good synthetic. Synthetic oils do not burn off or break down chemically as fast as conventional oils do. I'd use a 20w40 grade.
Depending on the miles you've driven you shouldn't have excessive ring wear but the valve stem seals may have dried out and cracked. If the usage remains constant and there is no smoking etc, you could either leave it alone or have new seals installed.
Average driving is approximately 1,000 miles per month so when figuring consumption, use that as a baseline. One quart per 1,000 miles in very hot conditions is a bit high....I'd expect to see 1/2 qt or slightly less. One odd thing though is that generally, especially in an engine that holds six quarts to begin with, at five quarts, the engine should not feel any different!!!
Also.....you use miles to determine oil change intervals. Oil is best changed at between 3K and 4K miles. Only way you use the 3month method is if you don't use it much. (you can run most good synthetics longer than that)

If it is not visibly leaking oil - the exhaust should be smoking. If the smoke comes out when you lift off your foot and when you start frost thing in the day, it could be valve stem seals leaking. If it smokes while you drive normally your rings need replacing.

2005 Jeep Liberty 4WD 3.7L MFI SOHC 6cyl ...

VALAC10W30
Application:
Use in temperatures above 0 degrees
Note :
Valvoline Premium Conventional 10W-30 Motor Oil


550015365
Application:
Use in temperatures above 0 degrees
Note :
Pennzoil Premium Motor Oil 10W-30 5+ Jug

Hope helps (remember to rate this answer).

a quart in 1000 miles is not excessive, no leaks?? then its going out the tailpipe, could be valve seals or rings,

Hi:
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.

sounds like bad valve seals,you dont always see smoke with worn or damaged valve seals but will comsume oil

no , is the jeep smoking or dripping