The exhaust check valve is broken. Burning oil?

Damage to the exhaust gas check valve will cause the car to burn engine oil and the exhaust gas will be blue smoke. The reason is that the waste gas valve is equivalent to an oil-gas separator. When working normally, it only absorbs waste gas, not oil. When the waste gas valve is damaged, it loses the function of oil-gas separation, and at the same time absorbs oil, which makes the engine oil enter the air inlet and combustion chamber, resulting in serious engine oil burning and blue smoke.