What should I do if the old Jetta valve has sludge?

The following is about "What should I do if the old Jetta valve has sludge?" Related introduction:

The old Jetta valve has sludge. Clean with cleaning agent or replace with new oil with better fluidity. There is sludge in the valve, which will make the fuel consumption of the vehicle too high, resulting in an increase in the fuel quantity of the vehicle, inability to refuel and idling jitter. Mud needs to be cleaned up in time.

Symptoms of valve damage are as follows:

1, it will affect the working efficiency of the engine and reduce the power of the car;

2. When the blade makes abnormal noise, the engine will have unstable idle speed or poor acceleration, and the overtaking performance will also be reduced. In severe cases, it will also lead to engine starting difficulties, misfire, air leakage in the car or increased carbon deposition;

3. The rupture of the valve will lead to the unstable operation of the cylinder, the engine shaking, the engine working inability, the blockage of the exhaust pipe, and even black smoke in serious cases.