Hello, there are many reasons for an engine to burn oil. Replacing a head gasket will stop leaks in the head, but it is not a cure all. You can have bad compression, bad oil rings, and valve guides that are worn. A new head gasket can fix compression leaks between cylinders and oil and antifreeze leaks.
Overall bad compression means both the oil rings and power rings are worn out. You can have bad oil rings and still run reasonable well if the power rings are okay. The valve guides are the small seals on the stems and with an overhead cam they are in the heart of the engine. Sometimes when the valley of an engine is plugged up, the oil can not return to the crankcase fast enough. The pooling oil is more apt to lay by the valve stem seals and be drawn into the combustion chamber.
Also check the PCV valve which may snorkel up oil into the induction system. Another sign of bad rings is blowby on the vent pipe.
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