What would make your car burn oil?

I am due for an oil change and just decided to check my oil and it was pretty low, I have no leaks or anything and was wondering what would cause this.What would make your car burn oil?
If you engine motor oil is low without evidence of a leak on more than one occasion you could be burning the oil from one or more of the following problems:


1- Blocked or defective PCV system that would raise engine crankcase pressure and push oil past the valve guide or rear seals.


2- Worn valve guides and/or valve guide seals allowing oil to be drawn into the cylinder.


3- Worn oil control piston rings allowing oil to reach the combustion chamber.


4- Blocked oil return passages in the cylinder heads which blocks the motor oil from returning to the oil sump, and the oil is drawn into the cylinder through the valve guides.


You can determine if your engine is burning oil by examining the electrodes on all of the engine spark plugs. Oil fouling will be black in color and may be wet or appears as a ';baked'; on deposit that looks like a small bit of coal.What would make your car burn oil?
either your piston rings are bad or its you valves.
normally, it's worn piston rings.





Cars are just going to burn oil in normal operation. 1 quart per oil change is normal.
Oil consumption depends on two things: the valve guides and piston rings. If the valve guides are worn, or if there's too much clearance between the valve stems and guides, or if the valve guide seals are worn, cracked, missing, broken or improperly installed, the engine will suck oil down the guides and into the cylinders. The engine may still have good compression, but will use a lot of oil.
bad valve seals or bad piston rings.
worn piston rings , bad valve stem seals , leaking turbo