What are the causes of oil burning in the Peugeot 1.8T engine?

[DeJoy]

The causes of engine oil burning are as follows: 1. Aging of valve stem seals: Due to temperature reduction, the rubber material of the valve stem seals becomes stiff, resulting in incomplete sealing. Oil leaks into the combustion chamber from the valves and burns. When the car has not fully warmed up, the engine exhaust emits significant blue smoke, but this normalizes after the engine reaches operating temperature. 2. Poor piston ring sealing: Due to faulty piston ring sealing, oil is directly drawn into the combustion chamber through the leaking piston rings under the action of the oil pump. Even when the car reaches normal operating temperature, the exhaust pipe continues to emit blue smoke.