what can cause oil consumption
Oil Leakage. A bad PCV valve can cause excessive oil leakage and consumption. A PCV valve helps relieve pressure in the crankcase. If the PCV valve malfunctions, crankcase pressures can increase, forcing oil through seals and gaskets.
Low alkali and corrosion resistance leads to intense corrosion wear. As a result, there is a second and third reason for increased oil consumption. And it is all also due to oil waste. Increased wear of the cylinder group affects the increase of oil consumption, mainly due to the increase of the gap in the piston oil ring groove.