I had a leak through the oil seals, after the repair the problem of fast oil consumption was eliminated. There may also be other external leaks, gasket under the valve cover, sump gasket, It rarely leaks. Also, an internal leak, the most common types of internal oil leaks in an engine are leaks through valve seals, that is, valve stem seals. After checking for leaks and repairing, I advise you to use high-quality oil, if you have a car with high mileage, you can pay attention to the best high mileage oil https://davesoilchange.com/high-mileage-oil/, there are good brands on this site that are suitable for your car.