Oil level is highly important for a long and stable engine work.
If there is no leaking, then oil burns in the engine. Part of the combustion products gets into the exhaust and clogs the filters, and the other part settles on the surface of the parts as a dense mass. And the lower the quality of the added oil - the more dirt it leaves in inside.
And the more oil you pouring - the more carbon deposits.
You can search less burning oil for a long time, use carbon cleaners and change valve stem seals without solving the main reason - wear.
In 80% cases, oil consumption was caused by wear of engine parts and the oil deposits only speed up the process.